[boomboomsubban]

It does, he'd still borderline fit that definition. He raised an average one year's salary for a game after ten years of self training.

[ratww]

Run-of-the-mill unemployed people that are outgoing fit the "NEET" definition better than him.

Also in Japan it seems the definition is a bit more broad than the acronym (otherwise even housewives would be NEETs): "In Japan, the classification comprises people aged between 15 and 34 who are not employed, not engaged in housework, not enrolled in school or work-related training, and not seeking work."

Self-training is definitely "work-related training". And he was doing housework.

[Biganon]

So he was in training for 10 years and now he's self employed.

[Hamuko]

I don't think that self-study really fits the definition of "training".

Selling your own stuff is definitely self-employment though.