We can compare the achievements of Barcelona in several seasons based on the final standings. 19-20, 20-21 & 21-22 (ongoing) Here he is.
From the 3 seasons that I tried to show in the picture, Barcelona managed to score more than 80 goals every season even though they didn't win the title. At that time they still had Lionel Messi and Suarez. But this season they have only managed to score 32 goals in 21 match, it is a result that is not imagined by everyone about Barcelona. Without Messi they can't do much in front of goal, it's a bad thing for Barcelona this season despite still having 17 games to play.
If you look at Messi's performance in the French championship, then we can assume that it's not about him. If I'm not mistaken, he scored only one goal there, although PSG totally dominates the domestic scene. Barcelona are now in a more systemic crisis than if they were suffering from the absence of one or two players. And judging by what I see, this will not change this season.