Here’s a relevant recent lecture from Alex Townsend, as part of Gil Strang’s 18.065 course, “Rapidly Decreasing Singular Values” https://www.youtube.com/watch?v=9BYsNpTCZGg
Currently watching the lecture series, and it's a great experience. In fact, this made me understand the blog post to some level I wouldn't have thought possible only a few weeks ago.