I think the point about MM and NIPSA here is not what he thinks, believes or even did or didn't do while he was TUS Whitley, but that there were many times last week when it would have been the right, transparent and advisable thing to do to out his hand up and point out the potential for him appearing to be at risk of bias.
This could have been raised, discussed, acknowledged and discounted.
It is the fact that he did not, at any point, when seeing the NIPSA logo on the bundle or hearing SM evidence about sss think, 'oh, I did forward a lot of emails and collate a response about that a few years ago, best point that out.'