If you count the election as the biggest possible poll, that let’s you infer which way the non-voters would have gone.
And if you are a non-voter, that means you have declared the eventual outcome as your preferred outcome, since you did not vote otherwise.
That’s vastly more complicated, only mostly true and only true for employees, not self-employed people.
So he might not be full of shit in this regard, but he’s clearly full of shitty-hustle-culture-nonsense!