Antelope Canyon pics get posted almost daily on Reddit. Lots of times by bots. I'm pretty sure I've seen this very pic before too (I didn't obsessively snoop into your post history to check if you were a bot or just reposting your own pics)

Nice to hear you had a nice tour back in 2013. I guess somewhere in the 2010s the place must've blown up because of social media (and the vast amount of pics posted here on Reddit)