It's an NHS Hospital, though, so wouldn't the risk of Covid be higher there? They certainly wouldn't have moved Philip there unless it was absolutely necessary. I know he's had at least one Covid 'jab', but that probably doesn't fully protect him.
He might have had an infection to start out with and it's affected his heart. The problem is that in very elderly people like Philip, the body loses its ability to repair itself, even with the best treatment. I read an article that said no one really dies of 'old age,' they simply die of conditions their body has lost the ability to recover from.
I hope he gets well again, but being in the hospital for this long at his age doesn't look good.
Also, I'm not anti-vaccines, but I'm wondering if the vaccine had an effect on his body as well. Being 99 and getting a vaccine is not the same as being 70 or even 80 and getting it.
Edited: Watched the video and it does seem he may have been wheeled out in a wheelchair but then clearly walked into the ambulance on his own, which is a good sign. But do wish the media would give royals privacy at times like these!