Well, yeah. Like others said, this is well-established already, and it explains a lot of things as to the virus's seasonal variation, and why it has come back with a vengeance so much and so suddenly in mid-autumn. It has very little to do with people gathering indoors more or violating mask mandates. It has everything to do with there not being enough sunlight in the ambient air to kill the virus anymore.
If anything, it means that most of the benefits of mask mandates and social distancing were a mirage, caused by them being implemented just as UV radiation was increasing rapidly—a classic example of a (temporary, illusory and spurious) correlation not being a causation.
Remember, there was talk that mask mandates might be sufficient to end the pandemic in and of themselves—but that turned out not to be the case. More likely, it just reduced the infections to a level the PCR tests couldn't detect, so that it shot up everywhere when the UV was gone. Even South Korea, perhaps the best known example of a prominent country to adopt mask mandates early on, is seeing cases rise pretty quickly right now. In fact, the correlation appears to have vanished: at best, now you have a slight reduction in the number of infections, but no real impact on the trajectory of the curve.
All because we mistook a force of nature (increasing UV light) for the effects of our own actions.
