Not sure if you read the page, but many of the examples are not "basic JavaScript syntax", the fadeIn approach is a function that attempts to replicate jQuery's, probably poorly.
No, jQuery did not invent the concept of fading in. It doesn't even have a unique implementation of it, it just does a few CSS changes that you can easily do without jQuery to get the exact same result.
This is as ridiculous as having a "addition" module in jQuery and saying that people who do addition in JavaScript are just reinventing jQuery.
Wrapping jQuery around something simple (like fading in) does not make it into jQuery. If anything this just demonstrates who incredibly unknowledgeable people are about where jQuery ends and JavaScript begins.
