I think it would be great if you could persuade PragProg to let you publish a Github repository of the code; ideally the original code with the commits to make it compatible with Phoenix 1.6.x.
The link to the zipped code repository is on their book page so it’s not as if it’s hidden from non-purchasers. Perhaps they didn’t want to deal with readers posting issues directly to Github.
I do think the book needs some kind of statement or sidebar about why it still has value even in a world where everyone seems to be adopting LiveView. Even if LiveView is introduced later!
One key reason I picked up the book again, which I bought in September 2019, is that I noticed you were still engaging with readers on this forum. So I do appreciate your feedback.