50% of what is reported?
I truly don't know and could imagine the real number is much less than 50%. The inflation includes made up deaths (how is the number substantiated?) as well as misclassified ones (terrorists/fighters who go uncredited).
Once those numbers are removed the civilian casualty count has to be attributed correctly - faulting Hamas for casualties caused by their own rockets and for casualties that were their human shields, and then we can hold Israel at fault for the rest.
If I had to guess, less than 25% of reported civilian casualties are "real" and less than 1% on a "fault" basis