The puppet masters have been removed” — Who are the puppet masters? The intelligence agencies who were running the show for decades upon decades.
“All vehicles of delivery removed”
— The flow of information through both traditional and non traditional means via intelligence agencies.
“Strings cut”
— very simple, intelligence can no longer operate.
“7th Floor No More”
— Relating to the FBI.
Q goes on to say we see all and we hear all, which implies WH’s are in control.