It could be. It's definitely on the way. The most useful definition of addiction I've seen is continued use in the face of negative consequences. When he was exposed to some negative consequences (ie, getting arrested) he seems to have quit using coke. Almost all of the addicts I've known would act like Bossman Jack and keep using.
I somewhat agree in principle, but I think you're putting the line way too far down. Negative consequences was destroying his friendships, his relationships with his in-laws, his relationship with the church, his literal brain matter. If you believe the negative consequences was just getting arrested, you're missing out on all the stuff leading up to it. And you're also forgetting Nick himself said if he hadn't been arrested, he'd still be using. And he's also said he wishes he could be drinking and using drugs right now. But he's not an addict. As far as I can tell, he has an addictive personality, but instead of drinking alcohol (and he's absolutely an alcoholic) and snorting cocaine, he switched to something we don't have tests for. If your first instinct upon being told you're not allowed to drink and use illegal drugs is to try to find something else that can't be tested for that you can abuse to get high, you're a fucking addict.
But weirdly enough, there's someone I knew of years ago who had a definition of addiction, where addiction was when it's something that becomes an ever looming preoccupation that negatively impacts your life, regardless of the amount you actually indulge in that thing. For example, someone who drinks heavily but could cut themselves off may not be an alcoholic, someone who drinks one drink but spends the rest of their time thinking about the next time they get to drink that one drink could be an alcoholic. By that person's definition, if you're pre-occupied with the next time you get to do drugs after you do drugs, you're an addict.
Oh wait, that person I'm referring to above was literally Nick Rekieta. He's both a heavy drinker and was a heavy drug user, who constantly thinks about, and wants to, drink alcohol and use drugs, but he's not an addict according to Nick Rekieta.
Lmao