Why did twitter change to x when elon musk took over?

I would assume it's an attempt to associate it with Space X.
A rebranding of sorts to paint a slick face over the former bird monikered platform.
He's done some odd things, this included.

It was the name of his first company that ended up being bought out by PayPal. He seems to have some kind of fixation with it, ie. SpaceX 👀

It's his favorite letter. Plus he name his son Six.