As the article stated, sugar consumption was a method of coping (when he felt stressed or overwhelmed). If you consider that the source of that stress is chronic or from something constantly being put away, then that repeated regular use over the course of decades becomes quite a tough pattern to break, since it represents a fundamental element of what keeps you sane. In these cases, the sudden removal is comparable to living a nightmare.
So I beg to differ that it's not (always) that simple.
Fasting wont take away the cravings, if anything it will make them worse (after a few days you feel very hungry and all you can think about is food, then there's a period where you don't mind, then you are starving again, and so on).
And even if it did, once you stop the fast you get the cravings again.
Willpower, propensity for addiction, susceptibility to sugar, etc. aren't equally distributed.
The people you're preaching to have tried all those things. Your advice cashes out into "land better in the distribution like me and then confuse it for a character trait like I do".
So I beg to differ that it's not (always) that simple.