Is "async loader" the thing where a page comes up as nothing but a list of URLs, unless you turn on Javascript? I see that with Instagram links - it's not even blank, it's just a plain list of URLs.
Async just means that there is a script, which, some time after the page is technically "fully loaded", starts to load some more! That's useful for updates or actions that should occur without a complete page reload (which would discard the "user state").
It doesn't necessarily mean you see an URL list. It can be implemented by storing the list in Javascript code - and you don't "see" that Javascript code.
The method you mention (mis)uses HTML Tags as datastore for the URLs list.
