What's not true? That Sweden or UK receive less solar radiation than Greece, especially in December? That building a huge transmission line from there (or, better yet, from Sahara) would be a very hard and expensive undertaking? That having enough batteries to sustain, say, 2 days of baseload supply, when it's cloudy and not windy, is hugely expensive, and has never been tried because of that?

Well, nuclear is also expensive, but it's partly regulation, partly nuclear being bespoke in many cases, while solar panels currently enjoy enormous economy of scale.

I all for nuclear, for the record.