You are right, using the word RGB is wrong in this case.
But now to my plan: As far as I understand the Toro can send a 31khz RGB(S?) signal through scart. And the OSSC manual says, that you can connect either 15khz or 31khz sources to any input on the OSSC. This would also fit better into my setup, because I can put the Toro into my scart switcher.