Perhaps, you'd like to try reading it again ... this time try reading the entire article.
Civilian proportion of deaths is higher than the average in all world conflicts in second half of 20th century, data suggests
www.theguardian.com
In case your reading skills diminish as you read, here's the salient part you conveniently missed (ignored?)
This article was amended on 9 December 2023 to clarify that +972 Magazine is an Israeli-Palestinian publication, rather than Israeli. It was then amended on 10 December because an earlier subheading said the proportion of civilian deaths was higher than that in all world conflicts in the 20th century; as the main text indicated, this should have referred to it being higher than the average proportion of civilian deaths in these conflicts. And it was further amended on 18 December due to a clarification made in the source article, stating that the conflicts being analysed were those from the second world war to the 1990s, not those during the whole of the 20th century.