mono-stereo Dermo had already replied to you to say he didn’t have a clue what you where on about.
Considering both you and Grant were able to take a stab at answering the question - it remains unanswered as to why he can’t also have a pop at it.
The main possibilities are either:
he knows the answer would show him in a bad light, so he’s dodging it;
he’s as dumb as a traffic cone;
or you and Grant have your hand up his ass talking on his behalf like he’s your ventriloquist’s dummy.
It could also easily be all three.