I've watched the whole video and had no profound realisation.
For those who can't be bothered to watch here's the summary of what they said :
a) He abandoned his style 4 games into last season
b) He signed players to suit the way he played at Ajax, but he's not even trying to play that way any more
c) He's doing the Ole style football (hoof it, then press) slightly better than Ole... but with 0 actual arguments offered as to why it's better under Ten Hag (it factually isn't).
d) Like previous managers, he's caved to the pressure of chasing short term results by doing what has somewhat worked before, not what he would like to implement.
e) United need to take short/medium term pain by trying playing the right way if it doesn't yield results at the start.
Now onto your post. No one has the "deluded idea that we are at the same level as Real" that's a complete strawman, argument. Secondly there are 0 compelling arguments made in your post or in the video to keep Ten Hag.
What is the point in keeping with the manager when:
a) he can't coach the style he wants remotely well enough in pre-season to even survive the start of the season (we got absolutely battered at start of 22/23). I mean, Postecoglou has just done it
b) he changes his approach at the first sign of trouble
c) there is no structure behind the manager to identify and make the right signings and to shoulder the responsibility of the squad rebuild
I'm sorry, but what is the point of Ten Hag then? Yes, Arsenal did protect Arteta and had Edu was in charge of squad rebuild. But did Arteta change his approach to football to suit short term? And if you don't have an Edu to shoulder the rebuild, while your coach is proven to be useless with transfers, is there a point in sticking with the coach? Given the lack of a decent football structure, what is the point of persisting with a manager who's messed up the transfers and has given up on the desired football almost immediately?
Might as well get rid to get a new manager bounce and save the toxicity. And prey and hope you land a manager who might manage to instil the right style in a time-frame ETH evidently couldn't. I think we'd all like the right structure at the top, but we have to take it as given that for now, under the Glazers, it's not happening. So again, what's the point of sticking with Ten Hag then? Just more money and time wasted, while the situation in the stands and dressing room deteriorates?