You are missing the point.Absolutely not, I agree with you but I beg you to listen to Pochettino's motivation. One thing is to say: Agnelli was wrong. One thing is to say: we lost because of the referee in a match where you did not have any episodes against. Pochettino is a great coach but he acted like Sarri when he loses and says the problem is to play before or after Juventus (search online).
Poch was ASKED about it in an interview.
He said he didn’t think it was proper for your chairman to rub shoulders in the tunnel with the ref before a match.
He didn’t bring it up. It was a question put to him by a journalist. He is completely justified in voicing his opinion. If you have an issue with him having an opinion, then there is really nothing else to add