They might want the courts slowed down, but if they do I doubt it’s exclusively about Nadal.
In fact I always hear in these forums how Federer is the most popular, best goodwill ambassador, sponsors’ Golden boy, fills the most seats, fan adulation, etc etc. Why undercut your favorite son?
*If* they are deliberately slowing down the courts there must be something the tournament directors , including Wimbledon and the USO want to do other than favoring one player who is in the last years of his competitive career. I’m sure they get feedback from each other, the TV networks, sponsors, players, etc.