I don't see how they couldn't. If this video was the actual evidence seized by law enforcement, it should have been investigated by them. This is not disputable. In fact, I've viewed 2 other video from this case, and both also appeared edited. It jumped out immediately. So How is it possible the police investigators missed this?
Btw, lawyers and their clients say things all the time that are not true or inaccurate. That's why it's the direct responsibility of the cops to investigate all the evidence.
“That’s why it’s the direct responsibility of the cops to investigate all the evidence.”
I would not advise anyone charged with a crime to rely on a the police to exonerate them.
I would strongly suggest that one leave that up to their attorney.