He says glutamine stimulates glycogen synthesis. True, but only when used as a substrate for gluconeogenesis, and then it's mainly liver glycogen, not muscle glycogen.
About the only time this is useful is for people on ultra-low carb diets, where the glutamine can replace carbs. Then again, you're talking about 30 grams and more of glutamine...
Dude needs to get his facts straight (or I do, but I'm pretty sure memory serves me correctly here).