Where is this latest information? The articles timestamped today or yesterday still quote two officers saying he was hit in the head with a fire extinguisher. I don't see reference to your last point.
1. https://www.lawofficer.com/family-of-fallen-capitol-police-o...
Which quotes: "Two law enforcement sources told the Associated Press that Officer Brian Sicknick, 42, was hit in the head with a fire extinguisher, according to The Post. He later died at a hospital Thursday night"
Link : https://www.lawofficer.com/capitol-rioter-filmed-hitting-off...