Actually, the user was benefiting from the blue checkmark of "verified account" and changed name and photo to "Elon Musk", that's got to be clearly a violation of twitter verified account terms, don't you think?
It probably is against the ToS, but it's also perfectly legal first amendment speech, which undercuts Elon's claims that he's turning Twitter into a free speech platform. Seems more like a Elon-sanctioned speech platform