a place for zinesters - writers and readers
If you overlapped a red zine circle and a blue comics circle, mini-comics would be the purple almond-shaped overlap between them. They are a subset of both the zine format/ethos and the comics art form. They are, if you will, the Reese's peanut butter cup of self-published books............Artists shouldn't spend too much time categorizing what they do. Just make something.
I'd consider half-size comics to be mini-comics as well, as long as they're self-published. I think the "mini" aspect of mini-comics can create confusion because it not only implies size, but also publication method (i.e. self-published). Obviously, I wouldn't consider something that's half-sized that's published Marvel to be a mini-comic, but I would consider, say, Always Comix to be a mini-comic. That's interesting that he makes that distinction though.