I'm okay with it, if a considerable part depends on bonus. If a player is successful and helps the club in winning titles, he deserves a big salary obviously. But another Fati, Umtiti, Lenglet contract, where he can sit on his ass, do nothing and still getting fully paid can't happen again obviously.
But with Laporta taking over, there were reports about him giving out a smaller basic salary and a bigger part as bonus. I trust Laporta that Lamine also has a big part of his salary depending on the team's and his own season.