I think this illuminates the difference that makes the difference here. A polymath is actually good at many things, not just has an opinion about them. This ta

I think this illuminates the difference that makes the difference here. A polymath is actually good at many things, not just has an opinion about them. This takes an unusual level of ability. In other words a generalist is not a polymath, because the polymath is better at the generalised abilities. That's what felt wrong about the article, it was conflating unusually talented polymaths with the ubiquitous averagely talented internet pundits :p