The ground stop was due to an aircraft emergency [0] and lifted within 21 minutes of being announced [1].
There are plenty of reasons to call out the shutdown, but using disinfo is the wrong method.
[0] - https://pix11.com/news/local-news/ground-stops-at-jfk-due-to...
[1] - https://www.fly.faa.gov/adv/adv_list?whichAdvisories=ATCSCC&...