The answer is yes. They already fought with Spotify over this. Spotify had to clean up their game quite a bit to pass App Store review. Apple still has plenty of leverage. Being the highest grossing app on the platform is a double edged sword - and Netflix needs to be on iOS even more than Apple needs them to. But it's very unlikely that Apple would go so far as to delist Netflix. Apple will just reject the new updates until Netflix submits a version that plays by the rules. If Apple delisted an approved (live) version of any app based on something extra that turned up during review of a newer update, and the change wasn't in the live version, that would be unprecedented as far as I know, and likely an error that would be corrected promptly. And the Netflix user base is so big, there's almost no way that error would be allowed to happen.