People often bring this up without noting that such a ratio would not be unusual in urban warfare against a well-prepared enemy even when the attacking army is doing what it reasonably can to reduce civilian casualties. Compare it to Mariupol, an example of what happens of the attacking army is unconcerned about civilian casualties: 25/26 of Ukrainians killed were civilians according to Ukrainian estimates. (8/9 were civilians if we use the Ukrainian numbers for how many of their soldiers were killed but the more conservative Human Rights Watch numbers for civilian deaths.)