This is an easy one. Just because design occured, does not mean that the principals of microevolution, mutation, or gene duplication are inoperative.
Evolution can occur around designed systems.
The two are not mutually exclusive. However, the evidence for major changes or generation of novel structures by evolution by natural selection alone is lacking. Hey Pangloss, you seem pretty good at finding refs. You can't believe in what you do. Can't be for IR and for speciation on any level.