Why is Israel attacking south Gaza after telling people to go there?

Israel has instructed civilians in the northern Gaza Strip to move to the south for safety, but Israeli warplanes have continued to strike southern Gaza. The Israeli military claims that Hamas is entrenched among the civilian population across the enclave, justifying the strikes. Israel ordered the evacuation to prepare for significant military activity in Gaza City and is expected to launch a land invasion. Despite Hamas urging Palestinians to ignore the warnings, there has been a mass displacement of people away from vulnerable areas.