Whilst they are a cunty club, I think this tweet is taking what he said and both exaggerating it and taking another bit completely out of context.
What he said was still out of order and disrespectful to City though. He said he will sign Haaland if elected as he has a release clause and he wants to join them (tbf it was reported at the time he signed the contract extension that he has a release clause where the fee ratchets down with each year or something like that). And the “signed documents” the tweet mentions are nothing to do with an agreed transfer, it was a document to put in writing that he’ll pay all 100,000 memberships if he doesn’t deliver this, or something to that effect.
Obviously a lot of election bollocks, they always say shit like this, but just wanted to point out that the tweet is twisting it a bit, presumably for interactions.