In terms of specific reasons to doubt the Gaza Health Ministry numbers specifically, I could go on forever about that, but I don't see the point of doing so on HN. It's not a tech-related question.
It feels more like an Israeli attempt at using fog of war and the masses ignorance on the matter to soften the reaction and spread doubt about the real numbers. As this talking point was continously used by Israeli spokespersons even after US officials believed these numbers to be fairly accurate. I would be happy to be corrected, I wish the numbers are actually less, and would want this to be the reality.
https://www.wsj.com/world/middle-east/u-s-officials-have-gro...