Hi DuRo55,
I just had the idea to run the question through AI... The AI claims that this switch should be some sort of isolation switch for the landing gear system. The gear system itself was very advanced in that aircraft (electrical gear), that's why an isolated switch in case of emergencies was built in.
Interestingly, the AI also claimed that the iniBuilds Spartan (yes, the AI directly mentioned the airplane from iniBuilds on its own), has the quirk of the switch not being operational. So your assumption is right and you can ignore that switch.
P.S.: I can't even start the engines (see my thread)... May I ask whether you can use the engine starter in MSFS 2024?