Matt walker has never publicly acknowledged it. He sets up a random word press site called the sleep diplomat dot word press dot com, which to this day consists of one post. If you were responding like you, aubrey gordon, were responding to somebody who wrote an essay, you'd probably tweed it outye? So how do we know it's him? Though, there's been some sort of, like oblique, indirect, third hand confirmation at one point that matthew walker has responded to the criticism.