The video reveals that Mike is much more passionate about LP's and phonograph playing equipment than the rest of a system. As to the size of the room and bass reproduction, though the area he has the speakers in---back behind the aisles of LP racks---appears rather small for the Wilson's, the room itself is not that small. If the LP racks were to be removed from the room, it might appear much larger.
I don't know how much those LP racks affect the propagation of bass frequencies, but I believe that is more determined by the dimensions between the room's walls---left-to-right and front-to-back, and perhaps it's floor-to-ceiling height. It may be that the long bass waves just pass over and around the racks, as if they weren't there. But the position of the speakers so close to the corners of the room can't be a good thing.