Meh, articles like that don't really phase me much. Yes, corn does contain corn gluten. But gliaden is that nasty protein that has been shown difficult to digest and damaging to the intestine. Heck, rice has rice gluten and I can tell you from my experience that rice is perhaps the only thing that soothes my gut when I have a gluten reaction. It sounds like this article jumped the gun a bit. Though I do agree that GMO corn isn't the best thing for you, I doubt it does the same damage that wheat, rye, barley gluten does.
Also, I'm a little leary of articles that state info. from a study or journal without adding in the link to the said study or journal. I take it with a grain of salt. There seems to be a great dislike of any kind of grain right now so it's not surprising to hear something like this regarding corn.
And like clanmcculloch said, I have an issue with the article when it states that 1/2 of all celiacs on a GF diet don't get better. Where is he getting that statistic from? When celiacs go GF, they may initially have intolerances to dairy, nightshades or other foods. This seems to clear up as your intestines heal. I know it did for me at least.