In the case of JavaScript libraries virtually everyone has standardized upon jQuery at this point. This guy really lives on his own planet. Maybe most websites that only need to add a small piece of JS functionality are using jQuery, but I seriously doubt that "virtually everyone" writing large JS projects is using jQuery. Google Closure Tools, Sencha/ExtJS, and MooTools remain quite popular, and a host of developers…
I don't think this is particularly controversial opinion to have at this point: http://trends.builtwith.com/javascript/jQuery http://trends.builtwith.com/javascript
Vague deployment statistics mean very little.