Keep reading; further down the thread, Rob "Commander" Pike found it "a surprise" that Google trademarked Go. Maybe Pike feels that Go isn't Google's language, but it certainly seems that Google does indeed have a modicum of control over Go, and that that control is above and beyond the Go authors' perception.
Of course not, it's not Google's language, it's Rob Pike's language. The logo was designed by his wife, and most of the questionable design choices in Go are there because of his opinions, such as the dubious dependency management and lack of generics.
A lot of the power of go comes from it being opinionated, but that same opinionated approach is a real pain for some (it turns out common) use cases. With all that said, Go is my language of choice, and I'm happy that Rob seems to be less involved with Go 2.0, and that the core Go team is incorporating user feedback rather than just dismissing complaints as Pike seemed so inclined to do.
