Their attack line isn't all that bad right? But I think they will run into the same issues with a player like Dembele as Barcelona did. Barcelona let him go because Dembele has never been consistent for an entire season. He has always had some aches and pains and then they couldn't cure it and it frequently returned and again he was sitting on the bench. Then he didn't do well in the training sessions and so on and so forth. I really don't understand that PSG signed Dembele when they themselves had a similar experience with Neymar who also was injured all the time. I think Kolo Muani was a good transfer although I have no idea whether he really was worth the money, but he might need some time until he can play his best.
Dembele is not a very bad player but I don't think he'll last at PSG because of the injury crisis he's faced over years when he was at Barcelona, he's become an injury prone player and that's what I expected Luis Enrique to be worried about before bringing him into the team, tge €50m they spent in getting him would had helped in attracting players like Kudus that's currently at Westham or other youngsters out there doing great.
PSG would had learnt from their experience with Neymar but they sold him to get another player that injury prone as well, however they got other interesting talents that would help them in future the team finally recocer their form, however if Enrique wants to perform well this season he'll need Mbappe's help and play him on his rightful position.