There is nobody who calls him or herself a darwinist on this thread. That's a term used only by those trying to poke at those who believe that evolution is how speciation occurs.
As for your challenge, if I remember correctly, you wanted DNA information on the two types of algae, right.
I'm sure they could do that for you. The point, however, was adaptation and selection, part of the foundation of evolution. Those were clearly demonstrated in the experiment.
This was an article in a lay publication, so I'm not sure exactly what tests were done on the algae. I don't have time to research that today.
The article I posted was from a university press release. I never run into copyright problems posting them. Here's the abstract of the actual article. You need a subscription to read the whole thing. From the abstract, it appears that they looked into the DNA:
Prey evolution on the time scale of predator-prey dynamics revealed by allele-specific quantitative PCR.