The tweet says he's not moving forward on the deal unless Twitter provides evidence that their monetizable user metric, which is not an estimate of bots, is accurate. Producing that evidence is not a contingency in the deal, so Elon is threatening to fail to perform, i.e. he doesn't want to buy Twitter under the negotiated terms.

He said: "My offer was based on Twitter’s SEC filings being accurate." Which is a valid statement, SEC filings are _required_ to be accurate.

And you've interpreted: "Producing that evidence is not a contingency in the deal". Which doesn't make a whole lot of sense.

He never said he didn't want to buy it under the negotiated terms, he said he wants to be able to _verify_ that what the company says is accurate.