For those who forgot, Musk joined Trump v1.0's advisory council in December 2016 [a], and resigned from it in June 2017 [b]. All of this played out once before.

[a] https://news.ycombinator.com/item?id=13175928 ("Trump Names Elon Musk, Uber CEO to Advisory Team – TheHill (thehill.com)", 92 comments)

[b] https://news.ycombinator.com/item?id=14465667 ("Elon Musk quits Trump advisory councils, saying, 'Climate change is real' (latimes.com)", 4 comments)