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What does the "alternative fact" of JD Vance fucking a sofa tell us about his character, given that it is literally not true?
We only know that it's literally not true that he described such an event in "Hillbilly Elegy". The fact that we don't immediately conclude that it definitely didn't happen reminds us that he's the kind of odious frat bro who would probably do that and talk about about it to his bros.
We're OK with "alternative facts" as long as we know them for what they are, and they tell a truth about the character of an actor if not the literal truth of an action.