I’d heard that one, too. But then I thought, “Selling them with bump stocks?!”
Binary triggers would be more accurate.
That is the fly in the ointment.
Unless it was to achieve other goals. So we have a primary of killing the prince, and a secondary of stirring things up domestically.
However, I have talked with multiple people who “know” the sound of various firearms. Not all of them are convinced that it was just a bump stock firing.
But sometimes a lone nut is just a nut.