Below 500ft the landing system uses live flight, weather and a/c parameters; weight, speed, altitude, AC position and wind.
Interesting. There is another topic about what wind to sue for landing; the tower AC wind of the FMC wind. (First Officer's Crosswind limitations - in Tech Log) The overall consensus was Tower wind. Now this situation seemed to be created by FMC wind at 500'. That doesn't seem consistent with what the rest of us would do without this magic box of tricks. We'd use Tower wind and ignore 'an inconvenient truth'. However, especially with such unequivocal SOP's, when there's doubt there is no doubt.
It was mentioned that if a crew disobeyed the G/A SOP it would be tea no biscuits at mission control. If that were the case I'd not be surprised if the crew were grounded at destination and could not even fly back to base. Hero to zero in a blink of an OFDM.