Absolutely 100% true!
United were a graveyard of talent and when undertaker Ten Hag arrived it only got worse. Only Casemiro or a similar player who has already won everything he could (5 Champions Leagues like Casemiro) and is now looking only for a fat contract can go to United in a clear mind.
Everyone has already seen that United is a swamp, so it will be extremely difficult to lure any promising player there (not to mention top players).
This is a fact that Manchester United do not like and it is true that for the last few years after SAF retired, Manchester United has been like a graveyard for potential players even though previously in the SAF Era they were one of the clubs that channeled talented players to other clubs

But on the other hand, hopefully there will be a new situation in the next few seasons because seeing from his current condition there are several young talents who have a good vision of the game like Mainoo or maybe Garnacho.
They are young talents that should be used as good progress because with the speed and skill that Garnacho has or Mainoo's dexterity in ball control is actually good for players of his age so that this can be a new reference and do not let this talent be buried again at Manchester United.