Orly? I guess he missed the async attribute (first one listed) in the MDN documentation he sited.
"As per the HTTP/1.1 spec browsers can download no more than two components in parallel per hostname."
Fortunately, browsers ignore the spec here and make more than two connections at a time per hostname.
"Faster page rendering, faster time when page becomes usable, faster page loading, better user experience. It’s time to let go of the DOM Ready Event."
In my experience, getting things loading in parallel is one of the best ways to speed up page load times, and a DOM ready event can really work out in your favor when you set the async attribute on a script. Each situation is different, putting all the script elements at the bottom of body and forgetting about DOM Ready events may work best many cases, but making blanket statements isn't really helping anyone. I wonder how setting the defer attribute on both scripts and moving them to the head would work out in the author's benchmark.