But it's that CEO that defines the direction of the company. He personally asks for users to be banned, and for other users to be promoted. Sure, he doesn't directly influence what users write, but he does directly influence what they see.
In 5 years Twitter will be absolutely nothing like what it was a year ago. But we're still in a transitionary period that's merely starting.
And since then Musk has been banning people on the left and un-banning people on the right, so the users definitely have changed already.