You should have also tested continuity from the console pins so you would have seen that pin in the cable is actually pin 9 composite video.
If you do not want to use composite video anyway then you can remove the 75Ohm resistor on the SNES mainboard, verify there is no composite video output anymore and connect CSYNC_o with a 300-470Ohm resistor to pin 9. That way you can still use your composite video RGB cable.
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