So I've seen every news agency on the planet run this story, and they either cite each other in a huge circle, or they cite "people familiar with the matter". Do we have 100% concrete first-hand documented evidence this actually happened to more than -let's say- 10 people? Somehow, I highly doubt it.
You'll also see lots of people claiming Musk somehow broke employment law by not giving notice of termination, which is unproven, and in direct contradiction with what he tweeted himself (he said everyone gets ~90 days of salary IIRC).