I just found it while having fun with noclipI've found it before, and it's probably documented in the SRB2 wiki
Thanks for letting me know!These strange Black Eggman portraits are actually placeholders. These were put in places where there are supposed to be alternate routes, But they couldn't get them finished in time for 2.2. There's always a chance for 2.3, However.
CEZ2 is famously unfinished in 2.2. The whole final section of the map (a clock tower you can still see in the background of the stage) had to be cut for time. Many of the unfinished routes were removed in 2.2.1, and I imagine that Brak is connected to it.Here's another cool one, from CEZ2. I'm curious what this path will be like if it happens in 2.3, it's in an interesting place.