@DaveReidUK
Your figures coincide with some PAX statements.
This means the AC was aloft in the region of 1000/1200 meters. There's no FDR data from 20:22:55 until the "stop" of the AC on soft ground.
It's supposed the max alt was in the region of 30/40 ft AGL (with the data given by the preliminary report)
The "gear up" selection is not at 30 ft but at less than 15 ft AGL.
And in the SIM captures appears to be made at 8 ft AGL (supposedly made after copying the FDR data).
In those extremely bad conditions, what could made the PF order "gear up" when the AC was LESS than 15 ft AGL (because the command "gear up", takes a while to the FO to move the arm/hand, find the lever and push, besides [I suppose] there wasn't a pleasant TO procedure to take it in the calm way).
If things happened as the data shows, the PF commanded "gear up" being 6 to 9 ft AGL and that's difficult to understand (to me).