Those figures are credible, based on research [1][2] that estimated total deaths including those by secondary effects from the attacks, like diseases and famine spread by purposeful destruction of medical[3][4], water treatment/sanitation[5][6] infrastructure and crops[7]. The figures quoted more often in the media, over 40,000 people killed, reflect only people that were directly killed and whose bodies could be recovered and identified, and so are gross underestimates of total loss of life.
[1] https://www.theguardian.com/world/article/2024/jul/12/gaza-d...
[2] https://www.thelancet.com/journals/lancet/article/PIIS0140-6...
[3] https://www.aljazeera.com/news/longform/2024/4/18/satellite-...
[4] https://reliefweb.int/report/occupied-palestinian-territory/...
[5] https://www.haaretz.com/israel-news/2024-07-29/ty-article/.p...
[6] https://www.youtube.com/watch?v=2SLwaodt_Rw
[7] https://www.fao.org/newsroom/detail/gaza-geospatial-data-sho...