I learned TDD as a development method. Too many people imagine TDD is about testing.

It's explained right there on the cover Test *Driven* Development. Not a testing method. A development process guided by unit "tests". In quotes as unit tests are at least 51% about forcing you to write small, isolated blocks of code with well defined and simple interfaces. Units. A large percentage of remainder is enabling ruthless refactoring (refactoring being a huge part of TDD's development practice/philosophy) by ensuring you have not violated those interfaces. Only a few percent is actually about having "correct" code.