This is an alternative fix to #123524.
This is necessary, because `sculpt_update_object` is run after
the mesh is evaluated, but before the geometry depsgraph operation
is done. Only after this depsgraph node is done, `DEG_object_geometry_is_evaluated`
will return true.
This approach of `unchecked` methods has been preferred for now
over moving the call to `BKE_sculpt_update_object_after_eval`
to a separate depsgraph node or after depsgraph evaluation.
e72730d763