A few things come to mind. Elon is a white Afrikaaner. Enough said. His word is as good as ancestry. Second, let's keep it a buck. No one was watching Don Lemon on CNN and even less were likely to on X. Third, Don and similar types (Billy Porter) that have sold out, are 'chatty Patties'. They spill all the tea. Even when the environment dictates they shouldn't. Elon probably doesn't trust him anyway, with good reason.
Point is if he wants to work elsewhere they are going to look at his response as a negative. Some who were considering him in a field of candidates are likely to think 'Why risk it?' he gets into his feels too much.