The way I read it, he meant that Go is not a great language. Go is "boring" as a language. However, it actually is a great programming tool. Great as defined by how long it takes to write module X, how well module X performs, how many bugs are in X, and how easy it is for a different programmer to come along and work on X later. In a real sense, the very design that makes Go boring is responsible for the good things.
This is an awesome point. I feel like programmers using Go care less about the language and more about the process of creating and maintaining a product.
I really dislike this description, which you see often in golang discussions because it implies either the people that prefer other languages are dilletantes focused on the wrong things, or the people who like golang are too stupid to use a more elegant language AND do product development.
I don't think either is true. What I do think is true is that every language makes trade offs and golang makes me less productive with it's choices & restrictions. I'm reserving judgement about how it impacts my teams aggregate productivity.