Hmmm. Last bit, sure thing. But they're coming together to have social contact and to sing together, in an enclosed space, and to give themselves up to a higher feeling of some kind. There are plenty of examples of outbreaks traced to churches in the US, which admittedly are generally pretty full. Also the average demographic, however sparse it may be, is prime covid-reaper age.
That archbishop twat comes pretty close to the idea that somehow god will protect people in churches. Not so different from the evangelical idiots in the US. Whatever a church congregation is, it is very certainly a social gathering, one of a highly intimate kind. Hence the word 'communion'. It's mad of him to suggest otherwise.