I was wondering what the rule is on using the 1 player, 2 controllers (1P2C) technique for a single player run. I know that 2 human players is against the rules for a single player run, but is 1P2C allowed? I had an any% and super story runs that were rejected for using 2 players when I was doing 1P2C. Could someone help explain this rule to me?

Thank you!