Ahh yes that reminds me of when Gilbert was arguing against “the primary axiom”, which is apparently some extremely weird version of evolution creationists have conconcted, which says evolution is supposed to always and only ever produce a net increase in complexity, information, innovation, and fitness. So when this doesn’t constantly occur(here they point to the LTEE for example), evolution is false.
One shouldn’t have to spell it out, but “the primary axiom” is not a real thing in evolutionary biology. You can go read Darwin’s origin of species and read about loss of adaptations evolved in one environment no longer needed in another, ativisms, vestigial features, and so on.