Perhaps that's a factor, who knows. However, first world countries like Australia and New Zealand have also fared well. I know there are other factors causing this, which I have mentioned myself. But could it partly be that the people there have been getting enough Vitamin D as the outbreak started in their summer and Australia in particular is nearer the Equator? It may be only a minor factor but sounds plausible to me.
Also, black and people of Asian origin have fared worse in the UK than white people. There could be a number of reasons for that, but it is well known that people with darker skins do not get enough Vitamin D from the sun in climates like ours.
There isn't enough evidence to be sure of anything but I reckon it's no bad thing to be running and cycling at the moment and getting plenty of that sunshine pill.