I don't get the impression that's a conclusion you came to on your own, and I don't find what is essentially hearsay or gossip to have a very high information signal in general.
That boils down to Go needing generics, which I agree with. I don't think we're completely in disagreement. I'm just skeptical that the language is quite as bad as you're sort of suggesting. That article falls short of condemning the k8s codebase and instead just says it could be better with generics.
To be clear I'm not the person who stated K8s has a garbage codebase or whatever. I was just linking relevant material (and I should have clarified that in my post instead of drive-by posting - sorry, was distracted).