So, if I am right, this secret guarantees a exotic from the exotic chest in the wall area.
Behind the chest is one of those taken power tower things. You can manage to jump up on top of it in a small area. I did this, and stayed there for a minute or two. Suddenly, my screen flashed white for no apparent reason. My team mate arrived and we all opened it at around the time my screen flashed. All three of us got exotics from the chest. I need to test this further, and if anyone else can help do so it would be appreciated.
Edit:For the people who are saying it is a troll, it isn't. Im just stating what happened to me, and that I would like to test it further. I don't have a video because I don't have a capture card and I wasn't about to record the raid on my phone for no reason. If you want to ask the people in my fireteam who got the exotics I can give you their usernames.
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Just make sure you don't open the spirit bloom chest