Amazing. It's not even that you might uncover a closeted player, like Whitney said...mundane things are allowed to be private, too, and shouldn't be forced into the public by a coach. My camera roll is essentially a visual diary of my thoughts: pics of my family, screenshots I've shared with friends or family, pictures of things I might want to paint, photos of myself making stupid faces that I send to my daughter when I'm traveling, just whatever strikes me. None of that is anyone's business, let alone fair game for the workplace.
If my boss wanted to see pictures of my family I'd show him. If he asked to see my phone and scroll through my pics I'd tell him no. But I'm a middle aged man and a lawyer. A kid trying to make the NHL? That's ridiculous. Jarmo should be gone too, since he knew about it.