It doesn't seem like an argument to me. It just seems like an interesting fact about Go. I don't think the post you are responding to is trying to say anything

It doesn't seem like an argument to me. It just seems like an interesting fact about Go. I don't think the post you are responding to is trying to say anything about GC so I've no idea what your comment is getting at. I'm yet to use Go but intuitively it seems like a good thing that the runtime is written in Go. It presumably reduces context switches if debugging an issue that seems to come from the runtime, regardless of if that is a GC related issue.