> infinite number of combinations you have to try before you find the correct one?

Kinda, but on Guitar, most pop songs are major/minor, possible sevenths. I think this post is aimed at someone who can read tab, but isn't "good" (what ever that means) so they should have an understanding of basic chord shapes.

The post does imply that this only really works if you can comfortably read tab, which is probably 6month-2 years of work (part time)