There are way more dedicated xbox fans in the USA than anywhere else. It's the only reason why is sold well in the USA initial. Xbox isn't nearly as popular in the rest of the world to begin with compared to Sony, so once Xbox lost most of them, it was over, and they went to the PS4 instead.
It doesn't matter. Once that word of mouth spread about what the X1 was doing, people jumped ship. I knew people that didn't even know X1 fixed most of the issues, 2 years later. The damage had already been done.
I don't think he lives in the US so he doesn't really understand how disastrous the reveal was in Microsoft's biggest territory.
It took years just for the average Joe to understand you didn't need to be online at all times and that you could buy/sell used games. And then all you were left with was a weaker console at a similar price, and the PS4 had already become the mainstream console in the US by that time so a lot of people just went with what their friends had.
He's not applying any context to the reveals at all, which is where his mistake is. Sony built up a giant fanbase with PSone and PS2. Playstation is a more well known worldwide brand. They can afford a fuck up like $600 and have it not kill their product, see: PS3. Even if he was right that the PS3 reveal and launch was worse than Xbone (it wasn't), that still doesn't mean it was as damaging to the brand as the Xbone reveal was to Xbox, which was the point the user he quoted was making anyway.
So explain to me how it tracked ahead of X360 for 3 years.
They didn't drop much on their main markets (USA and UK), in fact they tracked ahead on those for about 3 years, so how would you explain almost zero impact on their main markets with they dropping dead everywhere else? Did only people outside of USA and UK watch the presentation?
They took several years to be able to put the price on market acceptance while never being cheaper than X360. X1 solved most of the issues even before release (always online, DRM, TV, etc), had more exclusives at launch and before even 1 year in the market always sold cheaper than PS4.
The market for consoles is constantly growing and you seem to have forgotten about the WiiU. With WiiU being a total flop there were only two major players in the consoles market during the start of PS4/X1 generation.
Sony built well deserve brand recognition from their PS1 and PS2 era and once the PS3 reach price parity with the 360, they clawed their way back to eventually won that generation.
Mostly because their dominance in the Asian market and they have a very strong foothold in Europe/USA/World. They been the market leader for last three generation (Yes, I'm ignoring the Wii since that console mainly capture a fickle casual market that bought the console mostly for Wii Sport). Only reason Microsoft even had a moment to shine with 360 was because of PS3 awful price point at launch. PS3 was always slightly more powerful and feature a blu-ray players which explain why the console was always more expensive.
X1 never solve the main issue until they release the Xbox one S(slightly less powerful but offers feature that make it on par with PS4), there consoles was less powerful and they tried to sell it at higher price since it included a peripheral that no one wanted. X1 also never won the exclusives at launch because they ignored indies. There is no way X1 can recover in market they were never strong trying to sell an inferior product compare to Sony. Phil Spencer and his team has done an amazing job putting out all the fires and really offering value to their customers that Sony can't match or doesn't care to match. Xbox Play anywhere, Xbox game pass, backward compatibility & EA Access.
Although PS3 was slightly more powerful, the image of worse and without games have been held for more than half the gen because of the poor ports.
X1 had more high budget exclusives at launch (and yes the Indies they lost because of other mistakes we hadn't enumerated before).
Also comes to relevance that this is the first gen where the most powerful console won (or if you want to consider X1X then never the most powerful console won).
I agree with your points on the effort that MS team done (even though the most important that was having more studios took they 5 years to do a "5 min" action that is buying a lot of studios).
But bottom line we can see that there wasn't really a turnaround. From launch to about year 3 MS have been very straight forward that at first X1 was tracking ahead of X360 and then reduced that to tracking ahead in USA (and to this moment it still isn't that obscenely lower, nor did it grown to say it turned around) while EU+JP+RoW they started bad and kept bad. So how can we say they tun around on sales or success if the distance to PS4 only grow and their sales curve dropped outside of USA+UK?