Jacking vehicles in that situation would require air jack to be done safely but on a car that would cost about the same as my air jack to replace I’d be reluctant to use it unless the op was covering damages.That sort of peaty ground is very soft when waterlogged. Waffle boards help spread the load, but jacking can be tricky with the vehicle so far down already. Often causes bodywork damage.
I think you are right, the thing is pretty much bellied out on the edge of the track.
It may become a permanent memorial to his stupidity!
Sorry I didn't see the thread earlier. I would have suggested that no-one risk their vehicles going up there.