This source provided for proof are suspect at best. This is a source with an agenda which is not above ad hominem reporting stating that Norman Finkelstein is aiding terrorists.
A blatant lie. They are not a helpful response to anything because they can't be trusted.
As Al Franken has said about other stats, "They are pulling them out of their butts".

I don't have to defend by offering new impossible figures (it can't be done reasonably since no one knows how many casualties have occurred in any war) but to trust a source with an obvious agenda is futile. This source is hardly objective.