I don't know if Wagner has ever had any professional association with Tom House; however, the implicit assumption that House trains pitchers to look alike is incorrect.
House has worked with pitchers who have many diverse individual styles, but the underlying mechanics of all these guys are trained with attention to basic issues that almost every good pitcher shares in common.
House derived his guidelines for pitching mechanics from his research with large numbers of elite pitchers--in essence, he derives high-level teaching points from what works for the majority of pitchers at the top of the game and he identifies and corrects mechanical flaws that can prevent pitchers from achieving or maintaining their optimum performance level.
House has trained and conditioned pitchers with as diverse individual styles as Nolan Ryan, Randy Johnson, Cole Hamels, Anthony Reyes, Mark Prior, Akinori Otsuka, Orel Hershiser's son Jordan, Mitch "Wild Thing" Williams, Charlie Hough, Kevin Brown, Dan Giese, and many, many more... They all share the fundamental elements of highly optimized pitching mechanics, but they all look different when they pitch.
For those of you who may never have heard Nolan Ryan talk about Tom House before: