OC
I am also interested as to where you derive your nose down attitude from. There is no evidence that the FD was feeding the pilot false information and you are just introducing another red herring.
OC
BEA IR3 page 88
02:10:00 Pitch attitude decreases from 1.8° to 0° in 3 seconds.
Also visible in the FDR readout on BEA IR3 page 111
You shouldn´t be that fast with red herring.
In FL350 a 0° pitch can be considered a nose down attitude, as the aircraft won´t maintain level flight anymore. The crew had to react, that it ended in an unexplainable overrreaction is another thing.