Yeah, and Italy, Spain, and France are some of the sunnier countries in Europe (compared to Germany, UK, Belgium, Scandinavia, etc). If anything I would expect vitamin D deficiency to be less common there.
I don't know about Spain, but in both Italy and France the regions most affected are the northern overcast places. The impact around the Med is much smaller, despite much much more retirees
We had enough (more than enough, actually) sun this past winter here. The lock down happened after the virus hit us hard so your comment doesn't make much sense.
Anyway, we have VDI too even with our sunny weather. Not everybody likes sunbathing and the use of sunscreen with a high SPF is common.