There's really no such thing as de-lawyering the wording because none of those words are guaranteed to follow their normal meaning and so the following guess may be wrong.

Anyhow, it sounds like they're saying picking which type of gameboy emulation to use based on which type of ROM you feed it. I'm pretty sure most gameboy emulators have done something like that for years, but maybe they're using the filename instead of examining the ROM itself, so I don't know offhand, but anyone who wants to look at the VBA source could figure it out if they care to.