"I took a look. I don't see any significant difference between this and a traditional textbook."
I think he emails problem sets at appropriate times after you finish the book to ensure you remember everything.
Ok, then a traditional textbook plus an instructor-led course (which could be online) that uses it--but the course would appear to have a lot more assistance available. Still not seeing how the author's proposal is anything groundbreaking.
It's both. The proposal is at the very, very end, after a boring, long-winded screed about how everything else doesn't work.
> the author gives a link to his proposal
I took a look. I don't see any significant difference between this and a traditional textbook.