Here we go again. Can't test this out, have to just believe. Seriously? I'm guessing they already know that a DBT or AB/X could not be passed, so they have to claim it is not effective. That tells me everything I need to know, for now.
a) Brickwall filtering creates massive time smear. b) The human ear/brain is already known to be exquisitely sensitive to time smear. c) DBT and AB/X are really only sensitive to differences in frequency response. Using these tools for anything to do with music is like pounding a nail with a screwdriver. Ain't gonna work.
Edit: How can my ears/brain be keenly sensitive to time smear, but not if I listen without bias?