A DPT is only 3 yrs of not too challenging schoolwork (you need to study of course, but it is something most people can accomplish). The other things you mentioned require at least 5 years and are far more selective and difficult.
It misleads people when you put Dr. on the cover of your book because people automatically think you are a medical doctor. Why not put Kelly Starrett, PT, DPT instead?
I am a DPT and that is my opinion on the subject.