I think Todd Boehly might have underestimated the task to bring Chelsea to the top. Obviously, he really thought that money can fix everything, but he has enough good examples to look at and see that it is not the case. PSG is one example and if they played in the Premier League, they would probably not win it. Manchester City has one of the best, if not the best manager in the world with Guardiola and he understands so much about soccer that he can provide the club with info on all fronts in terms of the sport. Boehly did some experiments and it didn't work out. There are articles where he says that he wants the leagues to function the American style and maybe that is one of his problems. He is entering new terrain and things work a bit differently in Europe.
I would say he probably knew how difficult it was to bring back Chelsea to the top. He also a baseball team so it's not like he is a rookie lol. Strengthening a squad and fixing their situation takes a lot of time so it would take some time for Chelsea to be back again to where they want. But yeah they really need to start their trusting the managers they hire. And on top of all,
give them the time they need to restructure and bring back the club on track.
As for his idea of bringing an American way of things in football, well I am sure it is never gonna be accepted. There are lot of people who loves the football being handled the way as it is.