It’s definitely possible.
Although, many guys I know who have a shaved head, have a hair trimmer machine at home. It’s not like AP had some difficultly styled hair on the first 2 pictures released, just a buzz cut seemingly without different lengths, especially on the photo with the green t-shirt on.
Shaving didn’t get more difficult during Covid either where I’m from. There was enough electricity for the electric shaver and enough gel and blades for the manual shaver. I’m in Europe but I can’t imagine it was so different in the US.
On the other hand if somebody’s mood has changed, I can see they could let go of previous grooming habits.
If he had some special haircut before with full head of hair, I would more likely be inclined to believe it was pandemic related. Such haircut is not really possible to do at home unless one is a hair dresser or has a natural talent for doing hair.
Nor was it possible for us women to get our hair colored and get haircuts during Covid.