Evolution and selection would have allowed this to occur in nature if it was as easy as the regulation of six genes.
Tremendous survivability advantage and since we don't see it in nature for complex organisms, I don't believe these results.
It's possible that the exact combination of genetic changes necessary to make this possible were unlikely enough to occur together that the prior appearance of such an adaptation was unlikely to have occurred in the past. Some evolutionary "breakthroughs" have occurred once in the history of life on Earth precisely because they weren't of the kind that would occur several times in a few thousand generations.
But yeah, I'm skeptical too, for a number of reasons.