Yeah, that strikes me as a familiar use also. They seem to be using it to mean not only that but any software installation that doesn't happen via the Play Stor

Yeah, that strikes me as a familiar use also. They seem to be using it to mean not only that but any software installation that doesn't happen via the Play Store, so it's rooted in real history but also conveniently re-appropriated to imply it's veering outside of typically intended use cases.