A. The 1.5 million people have not "escaped" or been displaced "from Gaza", they've been forced to move to different places in the Gaza Strip: shelters predominantly. There's no ingress/egress from Gaza. It's basically a giant open-air prison.

Israel erected a giant cage around the land boundary of the whole strip in 1993. There's only 3 exits, all of which are closed: the Rafah crossing into Egypt, the Kerem Shalom crossing at the corner where Israel and Egypt touch, and the Erez crossing into Israel in the north.

Israel enforces a blockade of the shoreline, and a no fly zone. They destroyed Gaza's airport in 2001.

B. "More than half" is doing some pretty heavy lifting. 1.5 million is closer to 75%.

C. 10,022 / 2,048,000 = 0.489355%. Since the post yesterday, Israel has killed another 283 people which brings it up to 10,305 / 2,048,000 = 0.503%.