I don't know the circumstances of this case, but in many states, e.g. Texas my home state, simply having above an arbitrarily defined amount of a given controlled substance automatically gets you tagged with "intent to sell." An overloaded court system combined with a pay-to-win "justice" system means a lot of people take the charge in their plea deal even if they aren't dealers.
In the part 1 article, the author mentions "making tens of thousands of dollars a week" in relation to drugs, which is why I talked about dealing. Obviously I've got no proof of that or anything, so I'm happy to be proven wrong.
Drug charges are difficult. In my opinion, if you are using drugs personally, I don't really see a problem. If you commit some crime while under the influence which could harm another person, eg driving while drugged, obviously that's a different story, and coercing other people into it isn't great either, but if you're just smoking in your own home, its your body that you're altering. If you're selling to other people, that feels a bit more iffy to me because you're affecting other people with that... though I do realise that preventing the sale is effectively the same as preventing the usage...
Without judging this guy's current state, he makes it clear in his first blog post that he was a dealer.
"So instead of coming back home broke and apologetic, I ended up pretty deep into this and soon was making tens of thousands of dollars a week, very much unapologetically."
Then, after his first sentence:
"I was left with the difficult choice of either living there and walking to a temp agency with hopes of making $10.50/hour doing manual labor (without an ID or social security card at this point), or getting on a bus to NYC to see some associates, and coming back in a week or so with $15-25k in my pocket and living in comfy luxury hotels until I could rent an apartment... I chose the latter: and obviously, was back in prison after a short 14 months of addiction and misery."