I don’t believe anything that comes from John Cullen.
And I certainly don’t believe anything from the FIB.
I've never heard of the guy until the Trump assassination attempt. He had about a hundred hits on his youtube page a week after the attempt. The only reason I know of him is some Frepper was spamming the threads with a link to his videos. It looks like the spamming effort was somewhat successful according to the X stats...