I think the Varix is a 'lifestyle' shoe, and not part of the skate line? I remember seeing it at Foot Locker or something when it came out. Makes sense for the vibe of a Boys Of Summer collab, but that's probably why no one on the team wears it regularly.
I think it's kind of cool how they sometimes mix in a non-skate shoe with a skate collab, like when they did those Sci-Fi Fantasy sandals. Some skate brand is definitely going to put their name on one of those new Crocs-style rubber slip-ons.