How do I get to it? I could have sworn I knew what it was referring to, when the update mentioned the secret chapter, but, seeing as what I thought it was appears to end in the same spot I remember it ending the last time I played it, I must not have that correct.

Is the secret route referring to what is triggered if you wait on the screen where you're supposed to confirm shooting Dagio, but, if you wait for a minute, it sends you to Wonderland?  Then, after reuniting with Hyper near the end of what's currently available, there are a couple lines between Wolfstar and Anomaly before things end. What am I missing?