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.
Easily depending on the conditions. However, should FDm data be used in this manner, then it's not exactly how it should be used.
FDM should be there to aid safety monitoring and guide training, not to smack crews around the head with.
I know it does get used like that in some places, but that's not acceptable in my eyes.