The impression I always got was that glutamine will only be converted to glucose when the body needed it, so that's the POV of the second article. Also, I think average doses are 10-15 grams throughout the day, and a 5 gram dose after workout. If taken with a meal, even if all of that was converted to glucose is it enough to be a problem?
I'm not actually that familiar with diabetes, and I'm not an expert on gluconeogenesis. I'm just trying to dialogue and reason through it if that helps.