Dembele has the sacred number ten, which we hope will suit his PSG career very well. With Dembele present, the PSG squad really looks amazing the depth of their squad looks strong. But what makes PSG strong is still Mbappe, reportedly he is back playing for PSG. Under Enrique leadership it seems that Mbappe will be more confident about being able to get the UCL Trophy, if this season PSG gets a Trophy then I'm sure Mbappe will extend his contract with PSG.
I don't think the appearance of Dembele makes the PSG squad stronger. In fact they lost Messi and Neymar in this summer and Dembele is the only star player joined them. Other players they bought in this summer are not star players but we can assume it is big change in PSG policy. Whatsoever we must wait for some matches and maybe months to see how PSG perform in this season as well as how their new policy works.
Enrique only won one Champions League with Barcelona and his appearance is not a guarantee that PSG will win Champions League with him. PSG needs more than a coach, more than Enrique to win Champions League.