They wouldn't make a statement about that. Same way Sony won't admit the SUXAXIS triggers should be concave, the analogs should have dimples instead of domes, the PSP d-pad needs a shim, rumble isn't important, etc. etc.
Microsoft just ignore this kind of stuff. Trust me. If you e-mail them, they'll tell you to call their shitty hotline. Then the bozo who answers the phone will completely not listen to what you say and offer you a replacement controller. I swear, those people are idiots. You tell them a product is a piece of shit by design and they offer you an identically flawed replacement.