The math of population genetics precludes a Darwinian origin of these new genes in such a short time.
The theory has been made immune to empirical falsification because it is simply assumed to be true by default as the only viable option for materialists.
This phenomenon could rightfully be called a Tertiary Butterfly Explosion analogous to the Cambrian Explosion of animal phyla.
It is not like we Darwin critics make this stuff up. We just look at all the evidence and draw our conclusions.
According to Darwinism, the evolution of such a system would have required a plethora of intermediate stages that brought this locomotory apparatus into being.