Just out of curiosity, are the people who're entering your hospice from covid vaccinated against it too? It's not easy to discern if it's the virus or the vax if they've had both - and the reporting on it seems shoddy. It's possible that both can cause issues as well.

Anecdotally, regarding your coworker, I've found it around me too that it's some of the most athletic people had the worst time with COVID (not counting elderly or people with co-morbidities). For the people I know personally, they aren't sure if it was from COVID or the vaccine though, as they'd been vaxxed about a month prior to contracting COVID so it's hard to tell. That also speaks a bit to as to how well the vaccine worked lol.

Let me know what you think of that study when you get some time