There is no need to think more about conspiracies because those who get the trophy have also been recognized by many parties and have also been considered legitimate by many parties, such as Manchester City who were able to win the Premier League last season. Likewise, Manchester United were able to win the FA Cup last season, which must also be considered appropriate because both teams struggled to get one of these trophies last season and both can also try again to get it again next season.
I think what has been said to be a conspiracy is of course just an assumption or just a guess given personally without any strong evidence to support the claim, based on the initial post of members here who stated that there was a conspiracy only based on Pep Guardiola interview with the media which said: If all this time Guardiola has sympathized with what happened to Ten Hag at Manchester United, of course it is a funny thing for him to trigger allegations of a conspiracy taking place, as football fans of course our job is just to enjoy the spectacle and I think we don't need to speculate too much regarding things that are beyond our reach as spectators, so far I have not seen any sports media that considers Manchester United's victory in the FA final to be something controversial.
Manchester United won the FA final and they automatically qualify to play in the European League next season, so I think we should be more inclined to see how big their chances are in the European League next season, Manchester United still retains Ten Hag as their coach and I think the only one the way for Ten Hag to regain fans trust in his performance at Manchester United is of course by winning one of the prestigious trophies or better yet, by winning both the EPL and UEL trophies at the end of the season.