It's ok to be mistaken about something man. Your queepy remarks like "run along now" and "have a good night" aren't gonna get you far around here.
As already clarified, "big turbo" is a specific terminology on this (and other) platforms referring to large turbos typically built by aftermarket developers such as the aforementioned G25, CTS Boss, DBV2, etc. IS20, IS38, IS12, are all OEM turbos, yes different sizes and some are bigger than others, but specifically saying "big turbo" means something different than "bigger than".