Yes, I know it has been "reported".
I have never seen a single credible source for it.
Regardless, what we are talking about here is a very specific scenario, namely one in which a new owner (Jim/INEOS) comes in under a particular premise: they buy 25% of Glazer shares and effectively gain control over the "football side" of Manchester United.
The question is whether Joel (or any other Glazer) is likely to interfere with whatever decisions the new party makes on the football side. To me, that likelihood is zero. For two reasons:
1) He (or any other Glazer) doesn't actually give a shit/do not consider themselves football experts.
2) The new party obviously wouldn't enter into any sort of partnership like this without ironclad conditions being in place, i.e. regardless of what the Glazers think of their football expertise, they simply won't have any say in the matter.