It was my opinion; but if you want a bashing session....
I was using common sense the tank weighs in at 334 with just water and all of it sitting on the perimeter of 1/2" ply assuming it's screwed and glued together then the joints are already weak because ply is made of thin sheets clued together so sinking a screw into the side only tears the plys apart. Now if he used a nail or staple gun then I would hope for the best. If you've bought a similar stand from a store then you would know the wood is particle board and has fasteners predrilled and installed making the seams stronger. In the end I really don't care it's not my carpet or subfloor, and just because something is done a certain way for a long time doesnt make it the right way...