Good thought.

The conlang community calls them “Constructed Languages”, to attempt to clarify that an individual (usually) built it out of nothing.

Pedantically, all human languages were constructed by humans, but that’s one of those unhelpful distinctions that don’t help people talk about the topic. Clearly, Esperanto, Iso, Volpuc, Klingon, Elvish, and Lojban are in a different category than French, English, Russian, and Korean. The later are evolved with rules derived from common usage of native speakers; the former are constructed from rules and are no-one’s native language.

Conlang and Natural language are just terms to distinguish between them.