100 Bucks for for a DIY Backyard Pizza Oven and Grill.......
Using cinder blocks in a direct flame setting is incredibly unsafe. Cinder blocks contain moisture, and, when this moisture boils/expand rapidly, in the presence of an intense heat source, such as direct flame, the block can explode.
I've contacted Andrew (through his press agent) and asked that the video be taken down, as it is advocating a dangerous practice.
In the meantime, if anyone does clink on this link and watch this video, please don't follow the advice they're advocating. Cinder blocks have no place being near flame.