In short - Wrong. Your link claims exactly the opposite if you dig deeper.
The top stack exchange answer links to an article which states that fructose is in fact a chronic toxin in quantity, but that high fructose corn syrup is no worse than sugar or honey or maple syrup or many other common sweeteners. This is consistent with Lustig's claims. Read it for yourself. http://www.sciencebasedmedicine.org/?p=6501
Lustig claims that consuming a glucose only sweetener, such as maltose or dextrose or glucose should be lead to better health and weight loss when compared to a fructose glucose mix, such as sugar or high fructose corn syrup.
Speaking from my personal experience, I lost 3 inches off my waist while exercising less over a period of 2 months after switching all fructose sources EXCEPT whole fresh fruit out for dextrose.
The top reply is addressing whether HFCS is more dangerous than other sweeteners rather than the claims Lustig makes. Lustig agrees that it's not more dangerous than something like table sugar. What he is saying is that fructose (whether from HFCS, sucrose, agave nectar, etc.) is toxic in sufficient quantities.
So this isn't really debunking anything and it's actually in line with what Lustig says.
