Am I Going Crazy?

Hello!

I have a 2017 T100 black and for the life of me I can't figure out how to adjust the rear suspension. The manual says the tool in the side panel should do it, but the that tool does nothing to the little nuts at the bottom of the springs. I also tried two of my own Allen keys, marked as 6 and 5.5 (not sure what measurement) and the 6 didn't fit while the 5.5 was too small.

Usually when I google things like this I find lots of answers from people asking before, so I'm assuming I'm just missing something. Any help would be appreciated.