Much of what I have encountered in Positive Psychology (with a capital "P"; i.e. the relatively young field) falls into two categories:
1. Incorporating things from previous research that are relatively uncontentious (e.g. flow
2. Tainted by academic fraud (e.g. Critical Positivity Ratio)
Given that you can have #1 without defining a new field of psychology, I associate the field of Positive Psychology with #2.