Dirt Wheels like most other magazines are not pushing 2 strokes out, they are just showing us what is new, and demonstrating some of the more popular quads out there.
The reason they do not promote 2 strokes like they do 4 strokes is simply that there are fewer and fewer people who ride 2 strokes because most companies stopped making 2 stroke machines...
If the magazines were to put mostly 2 stroke quads in the magazines then they would push away the 4 stroke quad people... Im sure they know who is putting more money in their pockets.
I have seen several/many articles about 2 stroke quads in each of the several magazine subscriptions we get..