https://github.com/dmulloy2/ProtocolLib/blob/master/modules/API/src/main/java/com/comphenix/protocol/reflect/accessors/Accessors.java#L117

and

https://github.com/dmulloy2/ProtocolLib/blob/master/modules/API/src/main/java/com/comphenix/protocol/reflect/accessors/Accessors.java#L137

There are three ccc in the method naming.

Ok. Are these methods actually used outside ProtocolLib?

I'm not really one to judge since I almost never use this library, but there are alternatives, so it's your call.