Yeah, we just say THC because it's easier than saying LCV or SCV and honestly, if I don't see the two next to each other, I can never remember which is which, because the difference is subtle.
Also, I usually don't believe anything I read on chipgiude - use it like wikipedia; it is a jumping off point to further research.
What the hell exactly is ORHC - oversized RHC? Do they just mean an RHC with an oversized inlay?