"Nintendo fired some staff and hired new developers"

SLIGHTLY believable before this. When you get into wishful thinking, the rumor is automatically proven false.

I hope one day (perhaps after zelda u has been out for awhile) someone at Nintendo reveals the true reasons behind the delay because that would be the kind of insight that I'd find interesting.

Nah. I agree the line about fired employees is not very believable and the timeline regarding the TP remaster in this rumour is likely wrong. I also doubt Aonuma wanted to push out a game that "sucked" and was "boring".

For once I actually believe what they said before; it's delayed because they're expanding it with more ideas. That and making it ready for NX one way or another probably.

There's a logical contradiction here. A different team was working on TPHD before, and the same website leaked this in May. Now if development was nearly finished we have to assume that it was redone quite early on and, if this is the case then it's illogical with the timelines of TPHD and Zelda U to be as described.
Also there's no reason why they couldn't show a trailer, if this is the only issue.

Finally, when someone hires or fires we inevitably here something about it but it's been absolutely silent on that front. Tough to believe.

Some of the logic such as trying to make the world more rich is probably accurate. But anyone could guess that. 

Reading through the comments, I agree with those who think that this rumor is false, because Tantalus messes up this theory

It is really hard to fill an open world with life. Xenoblade X likely shares a lot of technology with Zelda (Monolith Soft did a lot of programming for Skyward Sword already) and is lacking content compared to games like Skyrim which has much more to do and many more places to go to in it's world.

The days of 20 npc's and 10 -15 sidequests in a zelda game has to come to an end. They should be shooting for over 100 npc's and over 60 sidequests to even compare too the likes of skyrim and the witcher 3. You'll right this is a very important game for nintendo, it is an oppurtunity to show that they've caught up with their rivals.

Iwata and the higher ups took a pay cut to avoid laying people off which makes the rumour even less believable.

WWHD took 9 months, and that's irrelevant. TPHD has been in the works for years.

The rumor don't add a lot. If its true, then is a signal that they are working to fix the mistakes(what is exactly what they said they were doing). If it isn't, them the game is still coming next year anyway.

It's the kind of rumor that grab attention, but have zero impact on anything.