Keep in mind, this article was posted at 3am pacific, 6am eastern. Assuming the author is in North America, he was probably under a deadline and rather tired.
I have found similar typos from prominent writers. Sometimes they email me back, which I appreciate.
I found one in an article by Cory Doctorow on boingboing. I checked on builtwith.com, and they use WordPress/Jetpack. Jetpack has a feature that will warn you if you try and publish something with spelling mistakes, it is just not enabled by default.
I let Mr Doctorow know all this, in a very polite manner, and he responded with "many thanks". I'm not big on celebrity worship, but it still made my day.