This poll’s reputation is pretty right-leaning, isn’t it? So it would likely be on the low end of Harris’ range of polls?

Siena/NYT's problems are a bit more complicated than right-leaning. They do stuff with their weighing which gets exacerbated by their typically small sample sizes. E.g., they weigh it so high school edu is 27-28% of the electorate, but in September polled a mere 276 such people.