It's amazing that people look at all the failed experiments of ecosystem alteration through biologic vectors government inervention and think: "This time is gonna be different."

This works, too.

I read about some other plans where they bred mosquitos with a germ line mutation causing infertility. I suspect this is like that.

Because the mutants can't breed and pass on the mutation, it should merely decrease the population in proportion to the mutant population. The hope, I think, is they impair a population's breeding cycle just enough to reduce it temporarily (much like insecticides).