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I am sure that they can bench him if they want to but they need the go ahead from the management as well. I mean it's all about how you could end up with getting rid of a player, if you do not play him and make it very clear to him that you are not going to play him, then he will leave himself. This requires the team to realize that they want to get rid of him no matter what.
But since PSG is a French team and Mbappe is France superstar, I feel like they will get a lot of heat if they do not play him and that's why I am expecting him to play in every game he can. The way to get rid of him is to just make sure you talk to the agent and make it known that you do not want him on the team, if you can do that then it should be fine.
That scenario is not going to happen to Kylian Mbappe especially since PSG have given him some talking and deciding rights. He is a special player for PSG and I think PSG have indulged him a little too much instead of forcing him to be a more mature player.
If in the end Enrique will bench Mbappe for no apparent reason, then perhaps Enrique will not have many seasons at PSG. But things could change now that PSG have lost patience with Mbappe who wants to leave at the end of the season. PSG have tried to convince him to sell the player instead of incurring a loss at the end of next season when Mbappe's contract expires. So they have to sell him regardless of whichever team is interested in him.