Because Barr went out of the way to release a super condensed memo like 3-5 days before the report came out. Because we live in a dystopian hellscape, this whole thing was already starting to blow over most news cycles and definitely most people’s minds by the time the report came out. So while not super surprising to anyone who read the report, most people are not informed about the report or the conclusions it arrived to. 

basically, it’s surprising to most people because most people never read the report.