The link works for me.
But it says:
use_rm433_remote (Optional, boolean): Set to True if your setup uses Sonoff RM433 or any other radio remote control. Properly setting this parameter allows the platform to identify what to do with incoming UART commands. RF chip is known to catch random commands if not paired with a real remote (so called ghost commands). This problem is observed even with the stock firmware and most probably is a bug in the MCU firmware or in the RF chip firmware. Setting this to False instructs the platform to properly ignore such commands and thus prevent unexpected switches or light intensity changes.