They still use twitter.com. Frankly, I think everyone should refer to them by the URL, rather than this “X, formally known as twitter” bullshit. “So and so posted on twitter.com” is a perfectly valid way of describing any tweet on “X”.
I get that technically it’s x now, but they still use the same URL. They do this to maintain digital footfall on the URL, that way, when the current business inevitably dies, whoever buys up the domain and URL and whatever other assets will adopt something that many people still have bookmarked and find familiar.
Twitter’s death was sealed the moment the purchase was structured. Everything since then has been a mummer’s farce.