Earlier quoted context omitted.
In case you weren't aware, controlled trials have shown that vitamin d supplementation protects against respiratory disease [1]. This is evidence that the association you highlight is more than a spurious correlation. It's likely to be causal. [1] https://www.bmj.com/content/356/bmj.i6583
Updated NHS advice on vitamin D from [1] “ Coronavirus update Consider taking 10 micrograms of vitamin D a day to keep your bones and muscles healthy. This is because you may not be getting enough vitamin D from sunlight if you’re indoors most of the day. There have been some news reports about vitamin D reducing the risk of coronavirus. However, there is no evidence that this is the case.” [1] https://www.nhs.uk/con…
"No evidence" makes it sound like there is actually no evidence. There is evidence - it just got linked in the two comments that make up the root of this thread.