I'm kind of surprised that NYC publishes its own paper of record.
Does that make it less surprising? Publishing such a paper is routine for national governments around the world, as well as US states.
Combining those facts with the small number of copies that are still physically printed - nowadays it's mostly read for free online - doing it themselves is the only plausible option.
https://www.salon.com/2012/09/28/nine_terrifying_facts_about...
(And that link doesn't even account for any changes in the ~6.5 years since it was published...)