Zurich (which is mentioned in the article) sees ~1,500 hours of sunshine a year [1]. That's absolutely horrendous and not "lots of sun" by any measure.

I grew up in a place in France that gets slightly more sun than Zurich. I now live in the Bay Area Peninsula with 3,000+ hours of sunshine a year and the difference is incredible, especially in winter.

[1] https://en.wikipedia.org/wiki/List_of_cities_by_sunshine_dur...