Why the hell can't that guy's website support browsers developed before 2009? It's all text. Is that crazy italic on link hover (great bit of usability, that) not supported by pre-HTML5 browsers?
Maybe it's not blind elitism, maybe it's forethought elitism.
Meh. It's not that big of a deal. You can still see the content and the content is done logically so there aren't any crazy layout issues in plaintext.
Also, this seems to be happening because of his breakpoint at width <= 1024px I believe. Confirmed this on both Chrome dev and Firefox Aurora.
Actually, it comes down to font handling (I'm the guy with the site). Webfonts, CSS3 positioning, and HTML5 semantic are not supported in browsers older than 2009. So you can read the stuff but it doesn't necessarily look as good.
While banning Safari is very strange, the author acknowledges the browser issue:
"I know many would fault me for [not supporting IE] on TNL.net but the design decision of not supporting older internet explorer browsers was based on analytics data that showed me that only 5% of my overall audience was using those"
Remember, ignoring IE users is not necessarily about elitism, but can also be a financially sound decision.
It can also kill his future growth if he doesn't keep whitelisting each end every new browser signature (for find a better way to lock out old browser users).
It's also not a good idea to be condescending to your users. The tone of that message is anything but friendly. The "banned" message mentioned in another comment even less so.
"If you want to ensure the best experience, please install a browser that was developed after 2009."