While there is a danger of spreading yourself too thin (as the author notes, one project a week was far too intensive) there's mileage in the idea of "throw a load of ideas at the wall and see what sticks". It helps you validate an idea quickly and, if nothing else, builds a portfolio you can show to potential employers or clients.

Rob Walling has some good stuff on building micro-SaaS businesses https://robwalling.com/