Unless social distancing in practice is not uniformly effective, and a large number of people both stay indoors to social distance, and are still quite likely to catch COVID because they are indoors with people who don't socially distance.
Plus being indoors means a confined space with less airflow, less air volume, and almost no upper range UV sunlight compared to being outdoors; these all are significant factors for likelihood of covid spreading.
Uhm, that seems a tad convoluted. Are you saying people that socially distance themselves are more likely to contract Covid-19 because the ones that don't are so often outside that they will contract it less probably?
And further, that's not the definition of social distancing. This would obviously include indoors. I won't sit at my kitchen table with the postman for a coffee while I am avoiding public gatherings.
I am sorry, my sarcasm-radar is quite broken. Are you joking?
I would expect those that are leaving their homes are both more exposed to sun/less deficient in vitamin D and also more likely to contract COVID.
And likewise, those that are staying home are more deficient, but less likely to contract COVID.