For what I had gathered, these are no joke. Musk intends to use twitter as a backbone for something different, bigger, allowing more types of data exchange, integrating an AI, facilitating the monetization of anything, and leaning/influencing to the (societal and financial) extreme-right. A global platform distinct from twitter, modelled around the Chinese wechat, and so with its own name, part of a network of Musk-owned companies all named "x something" (such as x.ai, his artificial intelligence company).
It isn't erratic.