No. It is 100% A-OK for Ol' Muskie to ban who he wants for whatever spurious reasons he wants to post-hoc claim. It's his company, he can do that. 100%.
What people are correctly pointing out is that he rode in on his "FREE SPEECH IS GOOD" horse waving a "BOTS ARE BAD" banner, loudly proclaiming that "Only illegal speech will be banned", re-enabled a whole bunch of accounts for bigots based on bot-ridden unreliable polls, swerved hard to the alt-right lane, picked up a transphobic smoothie and blew both his feet off with a +100 Shotgun Of Hypocrisy by starting to ban people who mock, track, or report on him.