Hello Confit,
I think many of us were already aware of the discrepancy between the figure of 34 ft in 1.11.4 of the BEA "Rapport Final", and the 24 ft shown in the DFDR "Tome 1" table of the same document.
Thanks for bringing to our attention that DFDR Tome 2 of the same document appears to show a figure of 34 ft, in line with the narrative. The version you show magnified in your post is, I presume, the PDF copy, the poor quality and assembly of which we discussed earlier on this thread.
Another curious aspect of this matter is that an HTML version of the BEA report -
Habsheim F-GFKC - clearly shows a figure of 24 ft in both Tomes 1 and 2.
TGEN 334 seems to represent the last second of flight before the RA antennae (rear fuselage) reached the treeline. The ground between the northern extremity of the grass Rwy 34R and the treeline - a distance of about 70 metres - seems to have been flat, with minimal slope. One cannot, however, entirely rule out the possibility of a vehicle or other temporary obstruction being present within the wide, conical lobe of the aircraft's RA TRx. As the ground-speed of the a/c was slightly less than 60 m/s at that point, the RA values at both TGEN 333 & 334 could have been affected by vehicles or superstructure between the grass runway and the treeline.
Therefore, determining the precise RA datum at TGEN 334 would not in itself enable us to prove the trajectory of the a/c in the final second of free flight.