In this state, you can expect them not to be able to go further, if PSG can beat them, which is possible, then City may be left without the playoffs. I can't yet assess whether this is so bad, because if they can do it now, but then get a strong opponent and cannot get through the 1/16 finals, then it's the same thing. Maybe by some miracle City will now begin to emerge from the crisis of scoring a lot of goals (more than they concede, because they concede too many), and then everything will change for the better, but for now everything is the same and it seems that Guardiola does not know how to fix it.
I didn't think PSG can beat Manchester City even in their current state. Manchester City are not in a comfortable place in the standing and a win over PSG will be very important for them because it will significantly improve their standings and taking them from 22nd on the standings to 15th. This is a must win match for both teams but I think Manchester City will have a slight advantage over PSG.
Manchester City is a shadow of itself, and they can't defend themselves from the challenges they are passing through. Weak clubs was able to win them, what makes you feel they will be able to fight their way to victory in this match. PSG can perform some magic and win the match by luck, but as for City, no one knows if they have chosen to embrace failure.