Open source is not defined as strictly as what you are suggesting it is. If you wish to have a stricter definition, a new term should probably be used. I believe I've heard it referred to as libre software in the past
"Open Source Software" always refers to software that meets the Open Source Definition. "Libre Software" always refers to software that meets the Free Software Definition. In practice the two are often identical, hence the abbreviations "FOSS" (Free and Open Source Software) and "FLOSS" (Free/Libre and Open Source Software).
Although I don't know Google's motivation for using "Open" to describe proprietary model weights, the practical result is increasing confusion about Open Source Software. It's behavior that benefits any organization wanting to enjoy the good image of the Open Source Software community while not actually caring about that community at all.
Although I don't know Google's motivation for using "Open" to describe proprietary model weights, the practical result is increasing confusion about Open Source Software. It's behavior that benefits any organization wanting to enjoy the good image of the Open Source Software community while not actually caring about that community at all.