It's hard to tell whether this is a joke with a lot of truth, a genuine sideways takedown of the effort being reported in the article, a cynic's lament, or just a straightforward answer to the question of what would be the most helpful (if not most accessible) action for these authors. In any case I find it a tremendously compelling comment. It evokes a lot in a very small footprint.

edit: clarification

Papers in prestigious journals matter, but the location of a citation does not really matter. As long as the source is included in whatever you're using to count citations (usually Google Scholar, Scopus, or Web of Science), a citation in Nature is no more valuable than one in PLOS ONE.

The only wrinkle to this is that citations in more popular venues are more likely to be seen and re-cited.

This is good advice worth more than us here might expect. A bit of chatter about a paper is worth a whole lot. In a specialized field, getting 2 or 3 comments back after publication is 'a lot'. Doubling that to 5 or 6 interesting comments doubles the feedback and interest.