No Jim.
Enough food for all gets in to Gaza.
The malnutrition is the result of poverty, as in Egypt that Gaza was once part of.

In WW2, Britain was close to starving because of the U boat blockade.
We had calorie counting and rationing.
Child health has never been better than it was under the rationing.

Gaza can end the blockade any time by ending the war against Israel.
Prosperity would return.
They prefer war.