Exactly how is he a savant? Just in general old movie trivia?
He has general skills in editing and making movies, and he is a movie buff yes. Problem is that James isn't pushing himself harder. He's also got insecurities about his talents, which while isn't uncommon, isn't something you just let fester, especially if you're in the arts. His whole thing about him wanting to purposely make B movies is a crutch for him to think he can just underscore his work, while his want to be known and famous is one hell of a contradiction of personality.
My armchair psychology yes, but we all thought he was, up to a point, putting his all into AVGN. This was true, up to a point. If there's something I'd like to say about Screenwave, I can tell the disappointment isn't with the fact that he is working/managed by them, it's the fact that he isn't running a production studio
of his own. We can bring up the whole deal of him being an autist, but usually even successful autists tend to know to navigate business enough to know who to give jobs they aren't good at while they do what they do best. As we all could guess, Mike was likely helping him along before he was "let go".
And no, I don't think AVGN the Movie was his best effort either, and I haven't even watched the thing. Where I'm getting with this is that James is properly, if sad or in humiliation, is finding what happens when he isn't trying. Even anime autists have that whole thing about spirit and undying determination. James though is thinking that someone else will just pick up the slack as he just passes by, or will not suffer consequences. That's not how life works.