Whoops - I think you are suggesting deploying GitLab the application to your existing Kubernetes cluster. The issue, and highlight from the blog post, were about deploying your applications (in GitLab projects) to a Kubernetes cluster.
Yes, I was talking about deploying to our existing cluster. Pretty much the only requirement for software that we run is that it must run in our cluster.
Ironically, it's often harder to deploy applications that offer their own k8s deployment approaches because they often have their own opinionated ways of using it that don't match our policies.