I saw a video someone shot of a truck trying to drive through this and while “everything” is about 1.5 meters “deep”, it appears to be mostly water with maybe 4-6" of ice on top.
It looks more like a lot of rain runoff in the area mixed with hail that is floating on top.
That kind of explains the lack of damage to the roofs and the numerous cars that seem to be piled up as if they were caught up by a flash flood event of some sort.
EDIT: found the video of a truck driving through this:
