As Matt Levine explained [0] the “waiving due diligence” doesn’t really mean anything now. What does mean something is that he signed a binding agreement to buy Twitter, giving Twitter the right to compel him to close the deal, and there’s no “too many bots” exception, nor a “you were wrong (or even lied) about something you said” exception. He has to prove that it’s a “material adverse effect” which I understand is nearly impossible (he’d have to convince a Delaware judge that the company is worth at least 40% less than stated because of this, and in practice it seems these suits almost never succeed).
[0] https://twitter.com/matt_levine/status/1545151445057536001