Kubernetes only runs on linux, so it follows to reason if you care about k8s you should care about linux. My experience is also that good experienced sysadmins often use linux for their own machines as well.
Targetting a tool at macOS users, and omitting linux instructions, gives the impression that the tool isn't targeted at sysadmins or hackers (i.e. at us), but rather at beginners, frontend developers, etc.
