Israel is not allowing anyone to to conduct outside verification, and hasn’t for literal years. They deny UN workers visas, disallow any humanitarian worker from entering or leaving Gaza ( hrw.org/…/israeli-restrictions-access-and-gaza-hu…)

but Hamas is not fighting outside verification. The UN has also repeatedly verified hamas’ death counts in previous instances.

That alone should tell you whose statistic you should be more trusting of, and it’s not israels.