I can say it was meant to be tough and I am kind of happy it's not easy to find so far. It's located in the branch of recent passages where you don't join the gym. If there's only one option at the bottom it might help to periodically check the passage.
Is it even possible for the passage to change with time? I thought twine passages only changed when you pressed a button? Are you saying on one of the passages of the game if I go afk for a while words will change on me magically or something?
It feels like I've started at all the passages of the new content on the "can we wait" fork for a minute waiting to see if a bit of text would magically come to life and change itself, but either that's not how the secret works, or I'm looking for it in the wrong passages? More hint please.