Self-referential humor is difficult; to be successful, it requires the jokester to possess a level of self-awareness sufficient to recognize and mock their own foibles as perceived by others. When a joke misses the mark, it can come across as an example of the very thing it seems to mock, or worse: as mocking someone other than the joker.
In this case, the joke is aimed at an external audience, one who probably cannot differentiate between SO-the-system and SO-the-social-media-marketing. For a member of such an audience, all that is required is that they are aware that duplicate-closure is a thing on SO.
NOTE: this doesn't make the joke funny. Which may be the bigger crime here...
Folks will overlook a lot of crude and careless behavior for the sake of a really funny joke. Generations of comedians have demonstrated this! But deprived of the LOLz, we're left to analyze the mechanics and accuracy of the joke... And this rarely ends well.
In this case, the joke is... Kind of a non sequitur; there's no real connection to duplicates here. The joke in the original song was that the programmer encountered a stackoverflow exception and went to Stack Overflow for help; it was a one-off pun in a 10 minute video, good for a quick chuckle... Anyone expecting to find a tie-in or riff in the article itself though will have been disappointed; despite numerous questions asked over the years about recursion-triggered stackoverflows in JavaScript and Tail Call Optimization in JavaScript, including duplicates, there are no relevant links, no attempt to make the joke tie the musical number into the actual content on Stack Overflow, no attempt to make the piece more than superficially self-referential.
And that's the crux of the issue here: the marketing folks don't review duplicates. They don't answer or curate JavaScript questions. They're outsiders to the systems they're referencing, and signal that fact by failing to include anything that a JavaScript regular might actually recognize, opting only to recycle a tired meme in hope that it will make up for the lack of familiarity that would have enabled true self-referential humor: this is a hallmark of hack comedy.
...and, after all, what could be more appropriate for SO than a pile of cringe hacks? 😏