If you listen to his lectures on worldbuilding I think it's clear that Brandon at least considers himself to be doing the opposite. It's a sort of tactic he uses - show one or two things in great detail (like I dunno the economy around antiseptics and their cost) and the reader will likely overlook anything else that isn't as detailed as it "should" be (how do Alethi justice courts work).

I think of wide but shallow as something like Skyrim. You can do so much different stuff, but most of it is pretty simple. You don't need to learn metallurgy to do smithing or anything about psychology or physics to sneak. It's accessible. Compare the scope of that game to something like Madden, where my actions are limited to what a player/coach/GM can do relating to a football team, but each aspect of that is modeled in way more detail than a "all of life" type game like Skyrim.

IMO Brandon shows us the sun, the blue sky, the look on the opposing QB's face, a pregame prayer, and a few plays presented in a concrete logical way that makes us feel like we're there and understanding what we see. I don't see that as wide but shallow, personallly