Actually, it may, in a way that gives more clues about the depth of the ice/rock combo over the underground ocean. Larger craters, in general, will be deeper craters. If the craters are filled in when their bottom-most portions leak liquid water from the underlying ocean, and pressure from the rest of the lithoshpere forces that water at a bit of pressure into the crater, then we may have an indicator of the depth of the lithosphere covering the ocean.

Basically, what is the deepest surviving crater on Ceres?

That is the minimum depth of the lithosphere covering Ceres’ ocean.

It’s probably a bit more, because the pressure from the rest of the lithosphere forcing water through cracks will allow filling when there is no complete breakthrough. At some point the thickness remaining will be enough that even water forced up through cracks will refreeze before it fills a crater, and you will have a surviving crater.