Azak, that video is biased.
However, it does illustrate just how easy it is to concealed carry even for a skinny kid; even if he could only carry half or a third with holsters and be able to walk normally, that is still a lot of concealed guns.
And if you didn't read the title, and just looked at him before starting the clip I doubt that you would have ever imagined that this kid was carrying multiple guns, let alone over ten!
Clothing is very important to CC; far more than your "body type". Wear a speedo and your options shrink like a swim in iceberg infested water. Wear loose and layered clothing and you can CC just about anything that you can physically carry, with a good holster and belt.
Concealed carry is about other people not noticing that you are carrying a gun. The more astute observer can notice if you are carrying two wallet shapes in your pants pockets. Is this likely? Not very often. Most folks, if they are bothering to even notice your waistline, would attribute that slight bump as a: cell phone holder, iPod, Leatherman, camera case, etc...
And unless you are foaming at the mouth, look like an escapee from a rubber room, are bleeding profusely, or generally look like you just walked out of a plane crash, most people even if they think you are carrying will just ignore it; chalking it up to LEO, CCW holder, or just not taking the time to care about it considering all of the other things on their daily agenda.
Yesterday I carried a Government sized Colt OWB all day, Simply Rugged holster, just wearing a sweatshirt over a t-shirt, and no one said a thing; and for the record, I have never been called "overweight" at 6' 2" and 240 lbs. "Big/athletic" yes, "overweight" no.