I mostly agree with this about how lisp advocacy can be misleading. My one quibble is with his deemphasis of macros. I think they're only #8 on his list because he's been using Racket. A more fluent system for macros makes them far more broadly applicable.
I absolutely agree that "everything is an expression" deserves to be #1. Rust is the first non-functional language to steal this idea: http://lucumr.pocoo.org/2012/10/18/such-a-little-thing. That probably explains Rust's relative success with macros as well. My big insight doing Wart was to realize that "homoiconicity" was really nothing more than "everything is an expression". There's nothing special about lists in particular besides that.