According to Omer Bartov, scholar of genocide, the criterion for genocide is that there is intent to commit genocide:
The crime of genocide was defined in 1948 by the United Nations as “the intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such.”
https://www.nytimes.com/2023/11/10/opinion/israel-gaza-genoc...
There are numerous articles in the press reporting on mass graves of Palestinians killed in the war, in Gaza. For example:
Palestinians digging mass graves inside al-Shifa hospital, health official says (14 November 2023, Al Shifa hospital)
https://www.theguardian.com/world/2023/nov/14/people-flee-no...
Bodies are being buried in a mass grave at Gaza City’s largest hospital, health officials say. (14 November, Al Shifa)
https://www.nytimes.com/live/2023/11/14/world/israel-hamas-g...
More than 100 Palestinian bodies buried in mass grave in Gaza (22 November, Khan Younis)
https://news.sky.com/video/more-than-100-palestinian-bodies-...
"All the cemetaries are full': Palestinians buried in a mass grave in Gaza (23 November, Khan YOunis)
https://www.reuters.com/pictures/all-cemeteries-are-full-pal...
Israel Gaza: Drone shots show Palestinians buried in Rafah mass grave (26 December, Rafah)
https://www.bbc.co.uk/news/av/world-middle-east-67825385
etc etc.
"No intention to kill civilians" says this "soldier". Just pure lies.