Also no it's not an april fools day joke https://arstechnica.com/tech-policy/2023/04/twitter-no-longer-exists-as-a-company-merges-into-musks-x-corp/
Ars Technica
Twitter “no longer exists” as a company, merges into Musk’s X Corp
Company name change may be Musk's next step to launch X, the "everything app."