I think that's true of "free software," but I'm not sure it's true of "open source" - the primary meaning before the FOSS movements was open source intelligence (OSINT), i.e., intelligence collected from open sources. https://en.wikipedia.org/wiki/Open-source_intelligence I'd believe that a phrase like "open source code" or something (parsed as "open source-code," not "open-source code") existed in the way "free software" did.

(Also, the fact that "intelligence" has a jargon meaning other than "smartness" is a good example that that is in fact how language works.)