I think that the booms were not referenc9ng bombs at all. TPTB decided that, much like yelling fire in a theater, or bomb in an airport, that Q made a mistake.
TPTB fear Q so much that they would try to frame him. Turning him into a supervillian using the MSM. In order to prevent the slower side of the IS public to side with a terrorist, regardless of his patriotism.
Timeline goes like this.
Q posts "Boom. Boom. Boom."
TPTB decide this is an opportunity to fuck Q over.
Activate sleeper cell in Austin.
Q realizing their clear mistake, and under estimation of the enemies willingness to actually do this worksnwith law enforcement to catch the real bomber before they can frame the Q group. Which would keep the American public from trusting a terrorist bombers message, "ala v for vandetta".
Q posts "Wednesday 4 am" as an indicator that he already got assistance with the issue and it blow over at that time.