At this point, dont even acknowledge the name change. Just keep calling it Twitter if everyone is going to do the "X formerly known as Twitter" thing for all of time.
In a way, I kind of like "social media platform X" - not that the name change isn't stupid, but Elon wants "X" to be a ubiquitous thing that everyone knows. "X, formerly Twitter" can't go on forever, but at least this subtly says "you know, that thing with the ridiculous name that wouldn't really make sense if we didn't tell you what it was because it's a fucking letter"