History is rife with far wilder inventions than the comment-curating 'contraption' that I describe, that have been conceived and crafted, drawing from a far smaller source of inspiration than the clumsy comment made by joe_the_user.
In all probability, the sort of thing, I describe, would never materialize in the foreseeable future. It could just be a figment of my imagination.
The leaps and bounds that are required for such comment-comprehension - especially the two step thing needed for the software to assimilate the contents of the video and then contextually-observe that joe_the_user has not viewed the video, just by reading his comment - are probably far too great for the current state of Deep Learning and AI (someone well versed in these areas could chime in).
Or perhaps such advents in content curation - unbeknownst to us - are already afoot.
Surely then your quick dismissing of my "value-less" comment could be the butt of jokes for posterity.
Time will decide.