This can not be true anymore that you could breath under water. A lot of times when people get fat they feel like they are big and or growing more.
You know what he means, it just needs to be read between the lines.
He means he's a fatass. He feels "skinny" without carbs, so he feasts all day because when his fatceps lose circumference it makes him feel small and subsequently insecure. That's why he thinks "carbs build his muscles" and eats way too much.
Well, eating carbs will mean a lot of glycogen retention in the skeletal muscle, considering how most of the volume is water + carbs or glycogen. But this guy's just fat, overthinks, and also thinks he knows more than he does which is a dangerous combination. Disgusted, you are a guru and shouldn't give this kid the time of day because he's dead set in his ways. I predict it will take a good 2-3 more years of overanalyzing and reading boards before this guy will truly get it.
Unfortunately this kid doesn't understand that he's arguing with a guru. Whatever Disgusted says, you can be assured that at least a solid 99.9% of it will be indisputable. He'll have more luck if he just drops everything he "knows" and blindly listens to Disgusted because he won't be steered wrong. I wouldn't waste anymore effort on this guy. We've all met the bodybuilding-know-it-alls before that are 20% body fat, read everything on the internet, and "do everything correctly" already.