Of course they knew and they lied.
I knew they were lying at the time when they tried that cockamamie video story. It was inconvenient for the ambassador to get killed and they needed a distraction from the truth.
They were covering up arming jihadists.
Treason.
Everyone forgets that some poor schlub video guy was locked up for months without due process to further their meme.
Sounds like he lived the Kafka novel, and NOTHING was done about it.