The serial entrepreneur and world’s richest person seems to be letting his own personal views shape and inform his policies governing use on the platform.
Other parties (including the ones you mentioned) have sizable stakes in twitter, but they are much smaller than Elon's stake, not the other way around. (Remember, it sold for $44B, you can divide that by the numbers in the article by that to see how much each investor mentioned owns).
Musk knows that he needs to say/do outrageous things to keep receiving either attention on twitter or free press. He strives to be relevant to those who, for some reason, take him seriously. He's a pathological liar willing to say whatever ridiculous thing makes him appear as relevant.
“The words ‘cis’ or ‘cisgender’ are considered slurs on this platform,” Musk posted in response to a man who claimed to have been harassed by the term used perjoratively.
They're called fascists. They'll bang on and on about how your rights are being taken away so you should empower them to protect you. Then, the second you do, they'll be the first to take away the rights you thought you were protecting.