Fine, this particular action is not government control.
But the argument that taking away power from people because they're "fascists" isn't like fascism is not a strong one. These people are supposedly an existential threat to the fabric of America, and there absolutely is not a single group that hasn't simultaneously deplatformed them.
It suggests a question around who really holds the power here.
Private companies using their liberty to deny service to the leader of the United States government seems like freedom to me.