Earlier quoted context omitted.
No. He signed the merger agreement without doing DD into mDAU, and didn’t write any contingencies around mDAU onto the contract. You do your diligence BEFORE signing the merger agreement.
O, that seems pretty odd. I can't think of any reason for them to do that beyond trying to get out of the deal or incredible negligence on the musk side in not doing that before hand. Were they able to get that data before hand if they wanted it?
This next bit is mainly speculation, but the reason Musk is actually trying to back out is partly to do with the fact that signing the merger contract caused his other companies stock prices to drop and public speculation that his existing business would suffer if he needed to focus on running Twitter. The second and more widely believed version of events is that partly due in fact to his other stock prices dropping, Musk cannot afford Twitter without having to sell more of Tesla and SpaceX than he is willing to. Musk is already down to owning only 17% of Tesla and less than 50% of SpaceX, although that's complicated as some percentage of Tesla is owned by SpaceX and vice versa along with the Boring company in such a way that Musk effectively has majority control over SpaceX whenever he wants. If he has to sell additional stock to cover the purchase of Twitter he would very likely lose the ability to control everything except possibly the Boring Company.
What's more, the contract he signed effectively puts him in a position of buying Twitter at a substantial loss as the stock market has significantly fallen since Musk signed the deal. He would effectively be losing significant control of his two primary sources of wealth in exchange for something he has likely since discovered he cannot run the way he wants.
In short, this was a bad move financially when Musk first announced his intentions, it was extremely foolish of him to waive due diligence, and it became financially even worse shortly after he signed the deal, partly due to the facts that people lost trust in him for waiving due diligence while making a financially inadvisable move, partly due to the fact that he's actually pretty bad at math and doesn't understand the stock market, and partly because the stock market took a nose dive right after he foolishly waived due diligence and signed such a financially ruinous deal.
If you're thinking Musk is smarter than I'm making him out to be, please consider that Musk tried to insert himself into a cave rescue he had nothing to do with, was told not to interfere with the professionals that know what they're doing, and retaliated to being told to butt out by publicly accusing the rescue team lead of being a pedophile despite knowing nothing about the man.
Trying to offer to help without really understanding the situation isn't necessarily a bad thing, but randomly accusing someone of being a pedophile because they were critical of you is so far beyond acceptable behavior it's amazing Musk wasn't banned from Twitter as a result (it was where he made the accusation publicly). That level of harassment violates Twitter's ToS, plain and simple.