Gomobile bridges Java and ObjectiveC/Swift to Go, and probably entails the same overhead the author is trying to avoid.
Shameless plug: If you like Go and immediate mode UIs in particular, Gio[0] runs the same Go code across desktop and mobile alike. No bridging or native code required.
If you like a more mature framework and don't mind Dart, I think Flutter is an attractive toolkit. I started Gio wanting to write a Flutter clone in Go before going for the immediate mode design.