> ASS subtitles are particularly popular in anime fansubbing as it allows for advanced typesetting.

Those are just "SSA" subtitles. The difference mattered (ASS was an "Advanced SSA") once but now people just call it "ASS" as a joke. So Google is sort-of right, he could leave it out of the description.

I doubt this guy knows this since it's impossible he implemented SSA on his own due to how complex it is.