Reading the article, this doesn't strike me as inappropriate. "Self-driving vehicle technology is not yet at the stage of sophistication or demonstrated safety capability that it should be authorized for use by members of the public for general driving purposes" is probably true. The cars are good at what they do, but that doesn't mean they can handle all sorts of bizarre detour, road construction, rural roads, faded/incorrect markings, conflicting markings, control from officers/construction workers on the roadway, etc. It's a huge, promising field, but still under significant development.

They also say, "as self-driving cars improve, they will reconsider."

Seems fair.