It's really sad and insulting to the language itself to do this - while there's nothing wrong with the design assets and guidelines, this looks like it was a template bought for $29.99 off a design website.
The problem is that the design has no connection or correlation at all with what the design is for. The difference is superbly obvious in the slide masters - look at the code samples - that code looks like it has absolutely no place on a slide like that.
That's true of the entire design language - it's great for a startup trying to be cool, but has nothing to do with Go. It's like what we'd get if we asked one of our designer interns to come with a brand language and the only brief they were given is "It's called Go, and this mascot is non-negotiable".
