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I think that perfectly proves the author's point, though. The "self awareness" of postmodernism has filtered to even the most banal of sources and been left in the dust by the avant garde of today. Irony and sarcasm as critical devices are dead for anyone but the hacks.Only today there are only hacks. And everybody still uses irony and sarcasm.
Besides, the parent is right. Postmodernism is not a theory to inform cultural production (how people make stuff), although its confusingly referred to as such sometimes.
Postmodernism is a condition of a whole culture (or a whole society) and the inventions that appeared later on (the internet, mobile apps, interactive shows etc) that the author speaks about, only serve to make the world even more postmodern.
The core of postmodernism is that we have exhausted modernity -- and indeed there are no trends that are "new under the sun anymore", not just because everything has been done before (which is almost true), but because society doesn't care about following this or that form en masse anymore and then proceeding to another (e.g. how baroque turned romantic, turned 12-tone, etc. or similarly in any other sphere).
Instead, everything is fragmented, and everybody (artist or not) can do whatever they please and have an audience/followers. There is no canon and no single "normative" culture the way it was 80 or 100 or 150 years ago.
Plus, nothing is able to baffle anyone anymore -- in the way that each generation before could shock some part of the established culture (up to perhaps punk, but probably not even that, and not even 50s rock n' roll -- it only shocked the most conservative parts of society, and had no problem being marketed, sold, and dominating the airwaves in record time).
Postmodernism is also about having access to all the cultural production and modes of the past, and the internet and co made that even more so. Artists, politicians, marketeers, etc can borrow from any period, and repackage and resell everything, combine it, etc.
All of these things are what are described as the "postmodern condition" by the now dead French theorists of the postmodernism.
And none of those things is going away.
Even a total return to modernism or classicism across all artists for example, would still be postmodern -- because before post-modernism art didn't regress to previous periods, it invented new modes.