I disagree. Two main points of the article are "nothing is inherently slow about doing stuff in userland (as shown by the fact that we made a fast implementation)" and "kennel interfaces, e.g. particular methods of boundary crossing, can be (as shown by the fact that the way they made it faster was in large part by doing the boundary crossings better)".

The title gave me a reasonably decent idea of what to expect, and the article delivered.