The very idea that you can "breed" the gluten out of barley is pretty incredible. Indeed, if the testing is correct, 5ppm is ok for most Celiacs (though not me). Good on em! As long as it's marketed as still containing trace amounts.
I, however, am one of those people who can't handle the mysterious "gluten removed" beers, and though a beer brewed with this low-gluten barley would probably have less PPM, I probably still wouldn't touch it. There are quite a few good completely gluten-free beers out there now.
Still, Science! It's great there are people out there working on these problems.