Nate is right. The only reason he's a "darling of the left" is because the left liked that he accurately predicted Obama's two wins. But if you predict Obama's win it doesn't mean your prediction is meant to help Obama win, rather it means you're making a prediction about reality.
People that make predictions about reality beforehand have more courage than the 99% of people that spout political nonsense. Predictions can be checked and predictions in writing (or the web) out there for posterity are the best kind of predictions. Nate was right about Obama (twice) and although he was wrong about Trump, he was much less wrong than almost all other media outlets.
The notion that the predictions were pro-Hilary out of an effort to sway the public make no sense because being pro-Hilary when she's not really winning only (a) makes her supporters complacent and thus they may not vote and (b) makes the pro-Hilary predictors look like idiots when their strong pro-Hilary predictions turn out to be false. As that article says, Nate took a lot of grief from pro-Hilary predictors and those people now look like idiots. Nate OTOH looks good.
The moral is that come future elections, don't waste your time on the million different predictors and instead locate the few that have a good TRACK RECORD and just look at them. Assuming, that is, you want to actually know what is likely to happen.