It is worth noting that 538 doesn't keep a historical record of their predictions, making it difficult to really see how they predict outcomes coming up to a conclusion. You can only see the latest/final prediction.

538 also predicted lower chances of victory in the weeks and months leading up to that, then adjusted it on election day vanishing away their earlier guesses. This isn't wrong on the face of it, but people infer from the final datapoint to the conclusion later that same day about 538's accuracy.

What I am saying is: 538 needs to keep a historical record of their predictions.