Or you could call it what Linus on Wan show by Linus Tech Tips YT channel made up: ex-Twitter
You essentially say both of the names and the fact that Twitter is the "old name".
But as a F-u to Musk, we should just call it Twitter.
Whatever floats your boat!
There are multiple ways of calling it and I've just pointed out the one I find the funniest. What we can all agree on is that renaming Twitter was a bad idea.
(and everything else he did also)