Share 'Non-disc brake frame adapter?'

I ran across this adapter while surfing bike parts porn (a fetish in the dark world of bike porn).  It seems as if this conversion thingamajig will convert a non-rear disc mountain?? bike frame into a disc enabled frame.  Two sizes are available, 145mm and 170mm, and I'm not sure if this could cross (pun not intended) over into the CX world, but if they can make it for the troglodytes they can ma…