There are a lot of problems with "state" ownership of football clubs, I don't think it's unfair to add this kind of thing to the list.
Being the neutral arbiter in any walk of life isn't just about being impartial, it's also about being trusted to be impartial. We all know there are loads of rules in place to help referees maintain the appearance of impartiality, ranging from bans on gambling to certain clubs some referees can't be involved in, to a bunch of things I'm sure we don't even know about.
In fact, I think it was you that pointed out an English referee couldn't possibly referee Argentina in the WC due to the Falklands War. A war that ended 3 years before Michael Oliver was born! And you were right to point that out - because the appearance of impartiality is more important than the reality that MO really isn't going to care about the Falklands War or treat Argentina any differently because of it.
All of which is to say that while there are links between the owners of a PL club and a league who are offering to pay for PL referees to have a luxurious trip to referee in their league, it might have been smarter to not allow that kind of thing. Not because I think any of our officials are actually consciously corrupt, but for the sake of appearances.