Can it [NX] be better than the new Xbox? Take a realistic point of view: is Nintendo able to build a console that has got more power than Xbox?"

This is a very interesting and true sentence. Anybody can make a powerful console. Nintendo may or may not be doing so. I'm so hyped for NX it isn't even funny.

http://nintendoenthusiast.com/article/developers-on-the-next-geneneration-nature-of-wii-u-and-its-potential-updated/

Well, this was nothing!

The most encouraging part is who is saying it. CD Projekt Red is a PC centric company, their stronger console presence is recent. As people have said, devs stuck up for the Wii U pre launch too but look who they were: EA, Ubi, WB, Activision, all companies they had had some level of successful relations with in the past. And console centric multiplat big companies. And their praise was largely on stage - and Nintendo's stage at that. PC centric or those only partly devoted to consoles, like BethSoft, were silent on and off stage and even actively dissed it. So seeing a company like CD Projekt Red speaking highly of NX without being under pressure on a stage is good sign.  Doesn't necessarily mean much.

I'd take the word of CD projekt Red.

Still not buying it until I see how it performs.

I doubt they'd make the same mistake twice. NX is close to launch and they know something that we don't. 

I think the notion that Scorpio has to be expensive to have those kind of specs is a pretty silly one, given the price of AMD's latest GPU tech and the fact that it can be significantly over clocked and also that refinements to that tech will be made for 2017 cards.

RX 480 at retail is only $199, that's not what Nintendo or anyone else building a console will pay for it and that includes 4GBs of pretty fast memory, it's been said that this GPU can be clocked over 1500MHz, which makes it possible to hit 6.9TFlops, in a 2016 GPU releasing very soon, that's very cheap.
If something with the specs of that card can produce that level of performance then a cheaper chip, with fewer compute units could certainly hit 6TFlops if it was clocked fast enough.

Another point to make is that Nintendo would likely be using AMD or some other vendor, who does the work of making the processor for them, they go to a host of other vendors of tech to provide them with what they need, they aren't designing processing tech themselves or everything within this system to then piece it together themselves, they don't even handle the manufacturing of the final console themselves, because all games console designers within the big 3 dedicated console market place uses foxconn.

Tech to make a powerful machine is cheap, will only get cheaper by the time NX launches.
I find it laughable that anyone thinks even Scorpio will have to be anymore expensive than the $399 launch price of the PS4 back in 2013, when it releases in late 2017.

I don't think NX will be anywhere near that level of performance, but mainly because Nintendo seems to like their systems to be very low on power consumption, if NX was using the latest AMD GPU tech and some variation of a modern mobile AMD CPU then they could certainly end up with something a good 80% faster than PS4 or even double the performance of that system.
If PS4 can handle games like Horizon at 1080p 30FPS, then Nintendo would be mad not to try and make a modern console with the ability to run that level of gameplay and visuals at 1080p 60FPS.

If CD Projekt Red are commenting on it, then I think that hints that it's likely using X86 and something prett reasonable for modern gaming.
Eurogamer had eluded to Nintendo going to 3rd party devs to ask for their input on what they wanted in the next console when development for NX began, back in 2015.
I think the whole notion of an Arm based console or Nintendo going to another vendor besides AMD was a stupid one when they've been great partners for ages.

Hopefully Nintendo doesn't wait too long before unveiling and put to bed the ideas that make zero sense.

I understand what you are saying but with regards to the devs in 2012 keep in mind that the Wii U was coming out on the coat-tails of the monstrously successful Wii and DS.  In 2012, Nintendo was basically seen as being the Apple of video games and pretty much nobody in gaming thought the Wii U would sell less than 50 million units (and the very few who did were heavily criticized by the masses).  It was probably very easy for a develooper to praise the Wii U in 2012 just nobody had any reason to think that it might bomb.

In 2016, things are quite different.  Nintendo is far from top dog now and 3rd party developers are in a position of power over Nintendo.  in 2016, 3rd party developers are in no way pressured by public opinion to praise the NX or to even promise support for it and yet they seem to be doing exactly that.  Maybe it's just posturing and 3rd Party developers will cut support for the NX as soon as they see signs of it bombing like the Wii U did, but something must attracting their attention because Nintendo's reputation and recent track record as a console developer definitely isn't doing anything for the NX.

This is all VERY true.