autism subtypes

I've mentioned once or twice what I recognize as an autism subtype, the talkative versus the quiet groups. Some of us are compelled to try being social, particularly via vocalization, and some of us aren't. I find the skill level of such socialization (which is used in diagnostic criteria) less interesting a topic or grouping than the initial compulsion to socialize. Some have it, and some don't. I'm in the "don't" camp, perfectly capable of vocalizing but trending toward not. My monkeysphere is quite small, and I almost never feel an urge to expand it.

I've seen before where researchers tried their own efforts at subtyping. One study found 3 groups, but it wasn't particularly helpful because they "purposely made this data have three subtypes in each group by differentiating their global means". Sure, they found some behavioral distinctions from their almost-arbitrary groupings, but that's not the sort of subtyping that I'm hoping for.

Does anyone have access to this study and could summarize the 4 types that they identified? They're using objective means to identify biological distinctions, which is exactly what I'm hoping for. Even this summary doesn't explain what they found. :(