> Drastically overstating their case? Israel estimates tend to be pretty close to accurate. What's been walked back?

From the article we're discussing:

"The Israeli military was forced to change its story about the ambush several times, following the discovery of the bodies in a mass grave, along with their flattened vehicles, and the emergence of video and audio recordings taken by the aid workers. An internal military inquiry ultimately did not recommend any criminal action against the army units responsible for the incident."

I would describe that as a walk-back.