It's both! :-)

That's a perfect example of graceful degradation / progressive enhancement.

A JS event on the html element cancels clicks on those links and handles them in JS with AJAX so the page is not reloaded.

Yes, by including code that if run, alters what happens. For example, you can add JavaScript code that handles the "comments" links on the front page in the new way (fetch the data and render it). For those browsers that don't run the code, everything will continue to work in the old way (links will cause a request to the server, which will render the comments).