I agree it would be nice if the gaps in his primers were filled in, but it's to have a resource like this that can help give an understanding of at least some of the topics related to math and programming.

I know from my experiences that trying to read a discrete math or algorithms and data structures textbook can be very daunting. I've also tried viewing the lectures of the algorithms class on Coursera and usually give up because of the difficulty of trying to learn these things after spending 8 hours coding at work. Not having a background in computer science makes this into an uphill battle. Any resource to make this struggle easier is greatly encouraging to me.