You’re right, after checking it is only a LC Filter for the V1. However, I wired everything up as it’s supposed to be from the diagram in the manual:
The important step is to omit the positive wire on the ESC connector on the FC.
I do get (almost…) 5V on the OSD output (used for VTX and Camera), and after soldering the solder bridge accordingly, 3.3V for my DSMX receiver. The other side of the FC seems to contain some kind of voltage regulator/divider.
Worked so far on 2S and 25mw VTX through many batteries and crashes.