Ok, I deleted my posts in order to keep the discussion on track.
What other proof is needed? Im not sure if it was clear or something else is on the table.
We have Razbam acknowledge, a video of the same system, a word of a pilot, the nature of an FPM during ILS.
If the manual (written by Razbam not the real plane) says to actively put the fpm inside the box they are referring to FD, otherwise it would say put THE BOX in the center of the HUD and then keep the FPM inside.
Maybe i came too harsh on people who are not pilots, but the error exists.