You might be wrong because City is suffering from bad performance and they are facing PSG in their next match. That match is their only opportunity thay will determine their qualification to the round of 16.
If they don't win PSG, they will go down the table and automatically out of the game because tbey will only have one last match to play that wouldn't change anything. I don't see them qualifying easily.
It's true as you say, Manchester City is struggling in the PL and CL and a win against PSG could change the whole situation for City and that's why I think they could win the game. It's almost Pep's last chance to turn the tide, if he fails here City will have their worst season since many years and also drop out of the CL, so the whole team will be very motivated.