Do you believe that ?
In the absence of any evidence to the contrary, yes. There's still a lot of evidence we haven't seen but in the long run I don't see how they could get away with lying about such a straightforward matter.
To maintain such a lie you would have to have the FBI (analyzing the video), the forensics lab, a lot of the Waco PD department and some number of eye witnesses all in on the conspiracy. History says conspiracies on this scale fall apart.
We'll see.