No, knots per hour (admittely an unusual unit, but it works for echo tango) is a valid unit of deceleration - identical to nautical miles per hour per hour. Just as stall tests are normally done at 1 knot per second - or nautical miles per hour per second.
An aviators version of principia, an interesting idea, but I'm not convinced it would sell. Those of us whose prefered method of doing sums isn't using rules of thumb are probably in the minority.
G