These are glued on.
I just looked - they appear to be glued on. I've had several high-end pairs of boots (Asolo) with Vibram soles that lasted for over 5 years of near constant use while I worked as a wildlife biologist. I wouldn't let the glued on soles deter you from buying these boots. I wore them this elk season and, while they require a significant break-in, they are great grippy boots.