Note this Newsday article's last sentence: "Ryan pointed out that Aksu's team did most of its work outside the Black Sea, mapping the flow of water, the build-up of sediments and other evidence beyond the southern end of the Bosporus."
A two-year event is a geologic blip. The only effective way to discredit the Ryan/Pitman theory is to develop plausible other explanations for their geologic and archaeological evidence underneath the Black Sea.