I think what he means is that addiction is a physiological condition. A number of drugs leave withdrawal symptoms if you try to stop taking them (alcohol, opiates, etc), but this sense of the word addiction is medical only. There are lots of other things (like computer and gambling addictions) that have only a psychological dependence [so are learned] and could be helped with memory blockers.

As an aside, it's a very low-resolution mindset that disregards an entire article because of one perceived mistake.