Same here, I go back from time to time.

I wish the author did some more, these are so high quality.

I discovered it back when they were still doing screencasts (and when I was using vim) and learned some pretty cool stuff, like the m and t movements, and through it I learned about the then new kid in the neighbourhood, neovim. The author knew how to approach things and give useful examples and make everything easy to learn.

It's a bit sad to learn they haven't uploaded new content ever since.