Maybe they have and just don't want to share it with you...
Which is their choice, but I find that pretty silly if it's indeed true.
Not disagreeing with you. Just maybe they want you to find out for yourself, eh? That's what you always tell everyone else! Try it and see for yourself!
I certainly have noticed a difference in malt quality. Not going to do blind taste tests or any of that. All I know is I'm brewing better beer now because of it. If anything I think reduced O2 is better than not trying at all; an every-little-bit-counts sorta deal.