Uh, Wikipedia ( https://en.wikipedia.org/wiki/List_of_The_Simpsons_episodes#Season_29_(2017%E2%80%9318) ) AND the very article from the New York Post ( https://nypost.com/2018/04/25/the-simpsons-shatters-another-tv-milestone/ ) you mentioned says you are wrong. The episode that aired this past Sunday (April 22nd) was not episode 636. It was episode 635. The episode airing this Sunday (April 29th) is episode 636!I believe the episode itself even alludes to this. So you might want to revise this article accordingly. :)