This time PSG is even under more pressure and since they started working with Enrique, they still Enrique couldn't change anything in PSG that's why if he gets bad results in the Chmapnios Leageu there is a huge chance for this coach to get fired even in the middle of this season. Because regardless of the players they lost like Neymar and Messi, but still PSG spent lots of money during the summer.
PSG still has a chance to top the Ligue 1 standings and top Group F in the UCL, so I think it's not a big problem and Luis Enrique is not under complete pressure. Apart from the unstable performance in starting the campaign this season, I don't think their performance is very bad. Especially when you look at the changes that have occurred in the PSG squad, plus the change of coach, everything requires time to adapt. Indeed, sometimes we cannot accept it when we see a team studded with stars and the most expensive players in the world, losing to a team that is not the favorite. All teams have experienced defeat in this way, and we have even seen Man City in the EPL being beaten by Wolves surprisingly.
However, I agree with you that if Enrique fails to take PSG further in the UCL, or fails to qualify from the Group F phase, then it is likely that his tenure will end quickly. Yes, I mean there is a big possibility that Enrique could be fired by PSG management, tomorrow will be a very decisive point for PSG in the third matchday against Milan. On paper, Enrique squad can win, especially playing at home, and Milan have just suffered defeat to Juventus in Serie A.