Well they want UNRWA gone so all Palestinians starve and die.
But if UNRWA is gone, israel is suddenly responsible for feeding the people in their concentration camp. And they don’t want responsibility for their war crimes.
So instead of completely removing UNRWA the goal seems to be to cripple UNRWA as hard as possible, but still have it exist to provide plausible deniability to cover up their starvation of Palestinians.
Israel destroyed as many basic human necessities in Gaza as they could by burning their farm lands and bulldozing it, blowing up hospitals etc. So the Palestinians cannot sustain themselves without UNRWA anymore.
If israel manages to cut off UNRWA they can kill them all. People in Gaza are already eating grass from the amount of hunger they have with the limited supply UNRWA is able to get in.