I don't think that came close to cross his mind. It's simply an absurd request, that's why people in the audience started chuckling.
Maybe the prevailing demographics of HN is getting too young to get it, but FB asking Roger Waters about nothing less than Another Brick in the Wall, Pt. 2 to sell more of their business... that's either being cynically obtuse or being simply too dumb. In any case it's a waste of time for everyone.