Great list, Stephen! A few others I would add:

Design Matters (Debbie Millman is the Terry Gross of design…very NPR)

Design of Business/Business of Design (co-hosted by legendary designers Jessica Helfand and Michale Bierut)

O’Reilly Design (tends to have a design-for-tech focus)

HOW Design Podcast (hosted by Ilise Benun, this tends to be very practice-oriented)