I believe many have died, BUT there are still many remaining in Khan Unis and Rafah. Hence, the reason WHY the IDF has not continued its advances into these areas of southern Gaza.
The IDF basically has this area surrounded. They stopped advancing like they had been. They believe the remaining hostages are being held in the tunnels as human shields protecting Sinwar. The last remaining Hamas leader that has not been “neutralized”.
The other reason is that the IDF is not supposed to put more than X amount of soldiers into the border area of Rafah per their agreement with Egypt. Going back to their peace agreement from 30+ years ago.
Make no mistake, Egypt wants Hamas dead too. They hate them. Which is why they would not allow ANY refugees into the Sinai.
Telegraphing a specific date gives the other side cover to not make it & use it to get more concessions.