one of them was when tesla workers tried to unionize and he fired them all, unionizng workers threatens his comapnies bottom line, and by extension his life
strikes me as the kind of guy that would tell us about each attempt in detail immediately after they happened. No way he would keep that kind of clout chasing under covers.
Claim is plausible, I can't imagine having to be near him for extended periods without being at least tempted. I assume both attempts were family members and/or secretaries.