I took it to mean per offspring when I first read it, rather than per generation, so I'm unsympathetic to your point.
I missed the earlier argument, however.
Anyway, following this thinking would lead to an argument over semantics rather than a discussion of the liklihood of the mutation causing a new family of creatures.
IOW, gore is openly, brazenly, after countless corrections, lying to the lurkers. You have the choice of correcting him on thread after thread or just letting him snare who he can.
Then there's the matter that he's never wrong about any anything on which an evo is right. Even if the planets have to be in wildly elliptical orbits and the DNA evidence has to show that hippos are utterly unrelated to whales and 1720 has to mean something other than 1. OK, he confessed on that last one, or hinted in that direction a little bit, after maybe a week.
It just came to me. (Snicker!) The earlier argument is here.