I guess I'm not entirely clear on the mechanics of booty sex either. Why does the panel member think it physically impossible?
I admit to not having read the links, but it's possible that rather than thinking the booty sex impossible per se, ey might have thought it wasn't possible from the positions the woman reported the two of them to be in, particularly if she was saying (or ey thought she was saying) he was also doing something else to her at the same time.
As for this particular case, with multiple independent accusers, I find them more credible than the defendant.
