The reason for PSG they spend lots of money but they can't get anything in the champions league is mostly because they didn't have a good manager and they just bought superstar players while PSG didn't have a balanced team, this situation made chaos in PSG that's why they players couldn't have a good atmosphere in the team to have good performance.
If that's true, it means that the main problem is with their own manager so that PSG can't do much in the Champions League, even though they already have more superstar players in their team. Because a strong team is not only good on the front lines, but almost on all fronts must be good in order to continue to compete in the Champions League. And from what I've seen so far at PSG, I think what you said is true because PSG played like they didn't have good tactics during the match.