...so it does. Can't say that was expected; if anything, I'd have assumed it would redirect to Smashboards proper, kinda like pokkenboards.com does.
In my mind, it implies that this site will be getting a dedicated ARMS subsection, which would be cool. Precedent applies here, as said pokkenboards link goes to the Pokken section on Smashboards... though that does beg the question of why it'd go here, seeing as ARMS has more in common with the former two gameplay-wise than it does with Splatoon.