It doesn't sound like they actually understand why it works. I hear what you are saying, but evolution and mutations have their limit. What if this is just as lethal as ionizing radiation for them?
The system is non-lethal so natural selection wouldn't even come into play (unless these machines became so ubiquitous that mosquitoes start starving to death).
If it was a widespread system, the mosquitos which were immune to it (if any) would have a better food supply, and tend to reproduce more easily, and come to dominate the population.
Natural selection doesn't need a lethal system to come into play.
