(1) I don't see evidence that its, in general, the same people praising superblocks as criticizing superblocks, and more importantly

(2) I don't see evidence that they do the same thing, so even if it is the same people, there's no inherent inconsistency: both reduce local traffic, but by very different means which have different effects. Superblocks don't create a hierarchical network which favors long travel routes but prevents through traffic, superblocks don't create a road system that lacks through access on main corridors within easy walking distant so as to support mass transit, and superblocks don't increase walking/bike travel distance by the manner in which they reduce local motor vehicle traffic.