The Grace Potter album is the only one of those I've heard and although it's good, it's far from her best and certainly not what I would consider rock apart from a couple of tracks. Pretty much a pop record with a bit of Americana thrown in.

Michael Kiwanuka is an R&B/soul singer so WTF is he doing in the rock category? Also, his album is from 2019.

Still I wouldn't expect the Grammy's to have anything remotely akin to the stuff most of us on here consider rock so it's no surprise.