Is peer review generally done double blind? Who in the field has not heard of hinton s capsule proposal that would be a blind reviewer? Hell I'm not even in the field and I've heard of it.
It was already reviewed when they published the arxiv preprint, so there would be no bias in this paper in particular. And as now, everyone and his/her cat has heard about capsules, you'd expect that some others than Hinton et al might write about capsules, so you shouldn't be able to say "hey, it's Hinton because capsules!".