He is talking as a business owner and not as a programmer/coder. You should also consider his background in Lean Startup Circle. Fundamental rule of MVP (minimu

He is talking as a business owner and not as a programmer/coder. You should also consider his background in Lean Startup Circle. Fundamental rule of MVP (minimum viable product) is to get your product out there in the market as soon as you can. Writing tests goes in the opposite direction. The goal of an MVP is to validate your idea with real users. To see if it works or not in the first place. There is often very little time to write test cases or even look at edge cases. In that light writing tests doesn't make much sense.