No, it does not. An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs. [1][2]
You cannot just arbitrarily take long-established technical terms and redefine them to suit your needs or your rough intuition. If you look in the authoritative sources below, there are over 100+ mentions of Linux and Windows, as well as several mentions of esoteric and defunct OS like Haiku, BeOS and others. Not a single mention of Kubernetes.
This is because Kubernetes is not an operating system and it does not fit the technical definition of an OS. It is container orchestration software.
It is important to call things using their real names, otherwise, eventually, communication breaks down and no one knows what we're talking about.