Sorry, I was 100% sure having responded to this...
Yes and no. Thanks for your answer. I now understand the background, but still not sure, if I want an inactive or in this case even non-existent system to be presented in Cloud Insights. I can remove other aquisition units as well so why not Kubernetes clusters?
I don't to argue or complain, but I would be interested, if something like this is planned for the future.