The legal definition of the OS does not matter at all when considering the difference between failing to support something, and using a tool that explicitly stops something from working that otherwise works without issue. Play integrity is a tool which does not base any of its certification decisions in privacy or security, rather leverages it for anticompetitive reasons. This is known and trivially verifiable.
I do know what these terms mean in a legal context. I am claiming that play integrity is an anticompetitive and monopolistic tool, of which VW decided to use. I am not claiming VW is a monopoly. What you are claiming is their right to do, is not their right at all, and is illegal.