If you disconnected the autopilot and removed the FD's in IMC on an ILS you would find yourself immediately as the PNF and a call into the base TRE to discuss your inappropriate behaviour
So, tell me how the OFDM can tell if you are in IMC or not..?
I wouldn't think they are comparing OFDM vs METAR ...,
It's all bull!!!!. Not true at all. Nothing happens. No one cares.