Well, when directly asked if he thought biotransformation was occurring in NEIPAs his answer was "No."
I think that a lack of scientific evidence equates to "maybe". If they can test for biotransformation in one sac strain, they can test for it in others, or most, or all of them. Not impossible, perhaps impractical.
The jury isn't still out on this, actually it sounds like the detectives have not finished the investigation. If so, it's a bit early to be claiming biotransformation is a thing in so many untested ales. There very well may be a thing, but do we know it's biotransformation?
Edit: after listening yet again, he was being asked if biotransformation was the cause of the haze when he answered "No." Then he went on to explain the lack of proof regarding ale yeast. Then he's asked again if there is any biotransformation occurring bla bla.. "to the best of my knowledge there is not".
I wanted to make sure I was quoting him correctly in the right context.
Anyway, it's in the interview. Again, my point is not to say biotransformation is not happening. My point is to ask where the studies are to support so many brewing authorities claiming it occurs.