If those numbers come from Hamas, I don't see why they should be trusted. I also don't see the need to call it "terrorism," too, since there are plenty of other forms of brutality and inhumanity in war.

See my most recent article on the conflict, which considers whether Israel is implicitly punishing all of Gaza for Hamas's actions:

https://medium.com/grim-tidings/is-israel-blaming-all-palestinians-for-hamass-terrorism-06a4740cb46d?sk=0021bf4406abf0ddeeea8efe7323e58e