Having worked with Rust for a little while (about a year) none of this stuff is particularly esoteric. However it is a great list of things that are good to know, but you don't necessarily need all that often (or learn from the official rust book)
You're right, but for those learning Rust, there's _so much_ to learn, that having occasional reminders of the more basic things is really handy. I've been hobby programming in Rust for years and professionally for about 6 months, and I still picked up one or two simple things from this list.