Please assume good faith... Also if he was going to buy it, why would he do that? If he wasn't going to buy it, well if Twitter provides it, then he's forced to buy it so it doesn't matter if he reveals it or not.
I'm assuming that the OP is posting the question in good faith - Musk on the other hand has a track record of disclosing private information for fun/retaliation, whether or not it's legal for him to do so. "Assume good faith" doesn't mean you have to overlook everything about the situation when discussing the situation.
I'm not asserting that Musk would do anything illegal in this case, just that there's a reason the Twitter board may not want to give him private data. It's not obvious that he wouldn't disclose, either directly or implicitly, anything he's given.
Didn't he literally break the NDA with Twitter with some data they did give him? If I didn't dream that up, that alone proves there is no reason to believe in good faith on his part.
In Musk's case? Half of what he does is openly trolling.
"Assume good faith" means "assume good faith until reason to do otherwise", not "assume good faith no matter what".