My conclusion on this matter is that no one knows the true number. If you look at the article above they don't have evidence of an actual number to go against the 30,000 deaths claim. They say that different officials say a different number but are all in the same range. If you type in the title of the article a bunch of Israeli sites and publications would "repost" this claim and write their own article on how the numbers are faked. so you'd be swayed to think that but all of these articles are saying the same thing and nothing that stands out to give me a confirmation. I looked at NPR article about the matter and they claim that 17,000 deaths have been recorded and the other 13,000 deaths got from "media outlets." according to NPR The other 13,000 or so deaths in its overall total of 30,000 are based on accounts from "reliable media sources," though the ministry doesn't cite or say which sources those are. Al-Qudra tells NPR this reliance on public sources of information is the result of multiple communication blackouts, in which phone lines and internet service were cut in Gaza, sometimes for more than a week. This made it difficult to communicate with hospitals and upload the number of casualties to the ministry's database. During some of these blackouts, the ministry in Gaza couldn't provide daily death toll figures.
https://www.npr.org/2024/02/29/1234159514/gaza-death-toll-30000-palestinians-israel-hamas-war
At the end of the day, no one knows the true number because there are way too many variables at play. The only thing I can agree with is that there has been propaganda pushed about the 30,000 death count. Officials are saying that it is mostly women and children but one article raised the claim that that number should be mostly the soldiers who are fighting. This is a lot of hearsay