It has become clear that Israeli forces are not succeeding at taking out Hamas. Israel’s own estimate of Hamas casualties from October 7th to the ceasefire was one to two thousand Hamas deaths. This is almost certainly an overstatement, for obvious reasons.
Maps of the Israeli invasion show control of a fair chunk of Northern Gaza, but it isn’t full control: they still get attacked by Hamas in most of these areas. Videos of Hamas attacks often show amazing levels of Israeli incompetence, most often lack of infantry screens for tanks.