There are other reasons to dislike hot desking but COVID doesn't seem to be one of them: surface transmission is low risk, disinfecting a desk is easy and can be done by staff overnight, ...

OH yes but it would have to be done properly between uses and regular office cleaning would now have to be more rigours and costly than it is now.

Probably closer to how a low risk hospital ward is cleaned than the perfunctory wipe - you might also have to use those sealed keyboards designed so they can be cleaned.