This is... not true? I listen to some of his podcasts, and he seems to be pretty grounded in his approach. Do you have a specific criticism of his process?
(Also, this article was not written by him. That kind of diminishes your point, unless you argue that all authors on 538 deserve your disdain by association?)
It's literally on his website, and yes it's true (about him, no idea about the other people on his site). There's a lot of drama and such in that entire space, and I've spent many months following it all and listening to many different viewpoints from different people in that space. Each election/primaries cycle it's the same story over and over, Nate silver is cringingly wrong, states the opposite of truth as fact. On the other hand, you have other groups of people/companies who are like an order of magnitude quantifiably/verifiably more accurate, and they all make jokes about his "predictions." Basically he made a baseball algorithm, sold out, and now uses his influence to do what he's paid to do, support an agenda, just like CNN/Fox and other super biased news sources.
(Also, this article was not written by him. That kind of diminishes your point, unless you argue that all authors on 538 deserve your disdain by association?)