Free Software's only relationship to Open Source is that you can relicense OSS with the GPL just by kissing it (as long as you comply with any minor strangeness in the OSS license.)
Open Source tried to steal the energy of Free Software and steer it in a business friendly direction, but they didn't steal the term "Open Source" any more than Free Software stole the term "Free" from "free beer." These are just terms of art, certifications by two very established and influential certification bodies, and wittering on about whether somebody said they were "going to open the source and let people have a look at it" in 1973 is as irrelevant as the fact that plastic polymers are organic but not "Organic."