That's why the asshole shouldn't declare victory until all of the votes are counted. That's like equivalent to videos where you see somebody show boating at the end of a race only to get passed up right at the last second.
Declaring victory before the votes haven't been counted worked for Bush in 2000. Remember how that went?
And if Trump is mainly interested in causing chaos, declaring victory and then having to fight when people say that the count isn't over, would fit right in with his narrative that the Democrats are trying to steal the election through voting by mail. At the minimum he would ensure that for the entirety of Biden's term, there will be protests and screaming and lots of angry Republicans who will refuse to do anything that the president wants. At worst you'll see blood on the streets.
...A mediocre success for him would be a massive legal battle that ensures that he can stay on TV for the rest of his life talking about how democracy died in USA because Democrats were allowed to "cheat" and the Republicans would be the dicks they always are and nod their heads in agreement while trying to get all the donations and votes they can by capitalizing on the lies.