The "correct" meaning of a word is whatever conveys your intended meaning to the listener. Words have no inherent meaning, they are a tool to convey ideas. If you are conveying the idea you intend to when you say "JRPG" to someone, you are using it correctly. If you are not conveying the idea you intend, which depends on the listener's interpretation, you are not using the correct word.

Of COURSE it is correct to say "berry" when you point at strawberries, because you have accurately conveyed your idea to the listener. To suggest that this isn't "correct" in a normal, non-academic context is objectively wrong and represents a gross misunderstanding of the nature of language.