An editor at Grub Street reached out to clarify the situation. Apparently the similarity between my piece and their piece was complete coincidence - Grubhub Seamless gave Clint the same data that they gave me, and he picked out the same interesting morsels. Fair enough. However, Casey’s piece in the New Yorker needed to be credited, so the change was made in Grub Street’s article.
All wrongs have been righted!