As a leftist, while this is concerning, it's also important to remember that Meta censors left content as much as it does right content. So, while this announcement certainly seems to be in bad faith (what could Mark mean by "gender" other than transphobic discussion?), this should be a boon both for far-right and left discussion. Does that mean increased polarization and political violence? Surely, surely.
You know that this announcement is made to win favor with Trump. I would not expect that leftism will be any more allowed
That said, if they remove the political filter, they're opening the door for all discussion (even from the left).
Of course, they could surreptitiously filter out the left. Hell, why not?