The authors offer a selectionist explanation, which is nevertheless uncertain. Note the repeated use of the subjunctive.
This is by no means an all-or-nothing selection (as the impression is sometimes given). Rather, the alleles are retained.
They are not, per the National Academy of Sciences, a “particularly convincing example for speciation.”
The implication is that the editors — Denise Kirschner, Mark Chaplain, and Akira Sasaki — did not realize the article was about intelligent design.
I’ve fussed about this point for a long time. And Discovery Institute colleagues have occasionally chided me for my obsession.