Genuine question,
if they are faking the polls why don't they have more realistic crosstabs?
This doesn't mean the polls aren't junk, I am just saying why would they show Biden winning 25% of Republicans instead of just doing 10% and lowering Trump's percentage with Dems?
The simple answer is that they probably just don't know what they're doing and don't have a nuanced enough understanding of the electorate to fake crosstabs. A lot of self-proclaimed experts that support Trump tend to say whatever they feel must be true. I vividly remember Dave Rubin (cultural critic and poli-sci major) predicting last year that Trump would get 30% of the black vote and that Candace Owens would become a US Senator.