There's a lot more to it. He was given a mandate to modernise the team, to implement his ideas. He wanted the team working hard, he took off Vinicius with 10 mins to go in a game he won against Barca, replaced him with Rodrygo who'd track back a bit more. Vinicius threw the toys out of the pram, and Perez sided with him against Alonso.
They wanted a modern manager until they suddenly decided they didn't