Huge downgrade from Dembouz to Raphinha? In terms of productivity there's a very very slight one, if at all.
Dembele is more entertaining player due to his dribbling and speed, but that's about it. Last year's title was claimed with Dembele missing for the most important part of the season as usual... so...
They are very different players, true. Dembele better dribbler, faster, more dangerous in 1 vs 1 easily. Raphinha, better shooter, better defensively, more stamina, far fewer injuries.
I would say Joao Felix replaced Dembele so far, but on the left.