Where has the media claimed that? There's estimate that around 35% of buildings have been destroyed or seriously damaged. There is plenty of photography and video evidence to make that a reasonable guess. The U.N. analyzed satellite imagery: https://unitar.org/about/news-stories/press/35-buildings-affected-gaza-strip
I believe my eyes on that one. I've looked at a lot of footage.
So why are you making a straw-man argument that Gaza was "completely destroyed"?
As for genocide and starvation I can't tell one way or the other. However, I consider the bombing of a civilians home more than a war crime, because Gaza is within Israel's border. It's a crime against God. Children within Gaza are the responsibility of Israel.
Destroying people's homes can be a first step to genocide and starvation. One can't unsee what you won't look at.