We know exactly where the 140 number comes from. It is the number of officers who self-reported any injury whatsoever, from friendly fire pepper spray to whatever was the worst physical injury an officer suffered that day. (According to my quick google, this was a concussion suffered when an officer was pushed to the ground.) The difference between "beaten" and "self reported any injury whatsoever" is not remotely a pedantic nit-pick.
You think there were 1000 separate physical assaults on the officers that day, 1000 separate beatings, and nobody drew their weapons and fired at the rioters, except the guy who shot Babbit, who never touched anybody. That is quite remarkable. The easiest explanation for this is that someone responsible for counting had a very, very broad definition of an assault.