It's not mind-boggling. What he se said is sort of what we've all said in that Moyes brought in and all that United experience going out at once was bad and therefor he was never been able to cope in his first year.
A lot of that coaching experience went out the door due to Moyes sacking them. He made many bad decisions like that because he was a bad manager. He wasn't able to cope with pretty much any aspect of the United job because he was a bad manager.
No amount of time would have changed that
Then he's sacked and the same thing is repeated without much thought. Had Moyes been given another year it would have been better than him being sacked and LvG being brought in instead as Moyes would have had learned a ton what he did wrong and built on that.
You can disagree with that and be correct but that doesn't mean it's absolute bollocks. You can't really know that really, similarly to saying that brining in Mourinho would have been better which is a fair guess given the level of experience. What Schmeichel should have been asked by Keys was "wasn't it just wrong to hire Moyes in the first place given how inexperienced he was with running a club like Manchester United". I can imagine Schmeichel agreeing with that but that's me guessing like he did.
Moyes would have built more shit and thats about it, we're lucky someone at the club decided to pull the trigger on Moyes when they did. If anything they waited too long, and this season shows what a positive manager can do.
Say what you want about Van Gaal and i have particularly his poor transfers. But he qualified for the CL and won an FA Cup. Moyes wouldn't have did either of those things.
Much like Mourinho this season Moyes had lost the players and lost the plot. No amount of time was going to turn that around. And it's not like Moyes has went onto other jobs and shown himself to be a great manager who was just unlucky, he's been shit at Sociedad, Sunderland and West Ham too.
Whether the Everton job was a fluke or a perfect storm/lucky timing/right man-right place-right time or whatever. He hasn't been able to replicate that at another club because he's just not a good manager.