USCP basically confirmed Bowman's version of events today and no one noticed.
"On security video, a man was seen
trying to exit the door in the Cannon Building and then pulling the fire alarm that prompted the evacuation. USCP officers
had previously placed signs with clear language that explained the door was secured and marked as an emergency exit only."
So, he tried to exit, then pulled the alarm. And the signs were placed there (whether it's "clear language" is more subjective, but at worst he had a massive brain fart)
https://www.uscp.gov/media-center/press-releases/uscp-investigating-cannon-building-evacuation