Its not guarantee with Luis Henrique winning Champion League tittle with PSG although success with Barcelona because main problem in PSG its not head coach but players mentality. Difficult for all manager how to make one teams unity exactly in PSG have many star player and some of them more priority playing as individual than teams.
A big part of PSG's problem is head coach. They have never had a good coach in my opinion. If they had a manager like Pep, even if they might not have won the champions league, they would have been playing better. PSG struggle even against the least team in the league. With the kind of squad they have they should be able to win games comfortably, or at least play convincingly.
The time PSG had a good coach in Thomas Tuchel they got to the final of the champions league.
Another part of PSG's problem is their management. I don't think they understand how to run a football club. The coaches should be given more freedom to choose players he wants the club to buy and players that he doesn't need or want in his squad.