This paper contains both the quote and is done on 39 professionals. This seems like an easy mistake to make and not something I feel has an impact on the trustworthiness of his talk
I am confused by this comment and the overall sentiment in the video.
Short dev cycles isn't an accidental byproduct - it's literally one of the key parts of tdd.
The first google result for tdd has this:
> Test-driven development (TDD) is a software development process that relies on the repetition of a very short development cycle: first the developer writes an (initially failing) automated test case that defines a desired improvement or new function, then produces the minimum amount of code to pass that test, and finally refactors the new code to acceptable standards.