Correct me if I am wrong here. But a 'No flare' situation during a planned autoland would reflect at 500 ft Agl with a 'Land 2' or above 500 ft Agl with a 'No Autoland' message right.
Like I said correct me.
The "flare" mode is indicated as
armed at 500', but if this mode does not properly
engage at 60'-40' (B744) then you still need to take some sort of action: either TOGA, or if enough visual clues are available take over manually.
I suppose it's not much different than on the A(irbus)380.