You are ignoring the fact that the code shows an admin can have any trip they want. Fred Brennon was in a pb explaining this as well.
https://github.com/ctrlcctrlv/infinity/blob/1535f2c976bdc503c12b5e92e605ee665e3239e7/inc/functions.php#L2755
https://github.com/ctrlcctrlv/infinity/blob/1535f2c976bdc503c12b5e92e605ee665e3239e7/inc/config.php#L564