Comment by noirscape

It's a bit more loaded than that. 538 post-Nate Silver had a model setup that was apparently kind of a mess. 538 was apparently sending strange messages to Republican leaning polling agencies, demanding they gave far more detailed audit information than usual (with the implication obviously being that they were fraudulent pollsters), and the guy running the site had fairly openly tuned his model on the assumption people cared about certain talking points. 538 was predicting Biden victories even when the polls were so overwhelmingly against him that not even the most Democratic leaning polling agencies had trust in him; even if you aren't running difficult math, that means something has gone wrong with the model.

(Something which got worse after Harris was picked, although every polling aggregator went barmy - there's suspicions that a lot of polling agencies aggressively normalized their data to avoid being seen as biased, leading to an almost 50/50 split.)