He is not in hospital for long and I think when he has been in hospital before he has discouraged visitors. For the last 100 years there have been other methods of keeping in close contact with someone without seeing them.
I can quite understand someone not wanting visitors when in hospital. Just the fact that people are sitting around your bed, just watching, can be really exhausting. Childbirth apart I haven't spent more than a night in hospital since childhood, but, generally, I am unsociable when not feeling well - and that includes to those who live with me - I prefer to creep into a dark corner on my own and not be bothered until I feel better.