That is Cpap or Bipap machine in that pic, standard therapy for sleep apnea BTW Was he on oyxgen or are they so short they are using those, usually there is a tube on them to hook up oxygen. Are they using CPAP or BiPaps to treat Covid patients or is there is shortage of oxygen masks?
I have had Covid, I didn't have to go to the hospital and wore the same mask at home. But people with sleep apnea wear those masks every night folks.
But the thing with Covid is that no two people have it the same. I've known people in better overall health with it, that almost died and I had a mild case felt really sick two days and tired for ten.
Here is hoping he has a speedy recovery.