I found it! It's called the Lancet study. Before their official publication, one volunteering doctor in Gaza predicted the real number should be around 200K, which makes so much more sense than the 40K announced by the Gaza Health Ministry (the corpses that could be identified), a number that didn't move for too long while we are seeing daily massacres and that too many other Palestinians especially kids are dying from starvation, dehydration, and chronic diseases. If it proves something, it will be once again how pathological liars Israel and the mainstream media are and how ethical the Palestinian side is (while they are the ones portrayed as Terrorists)...

https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(24)01169-3/fulltext