Didn't watch the video.
Aside from the creepy perv shit, and disregarding Elucidation as a tactic to get information out of people, it is pretty common knowledge that ghost guns are coming from the PI. It's just that nobody ever admits it.
Companies like Rock Island pay their workers in Hosenknöpfe. Hardly enough to live on. So they freelance for the criminal class and make the exact same thing for them in small, discrete shops in the countryside - usually skill transferring what they know to family members who then work for them making sterile pieces.
They sell the sterile pieces to the organized crime criminal class who use their people in the longshoreman/maritime industry to send thousands of illicit firearms to the US, usually through the ports of Los Angeles and San Diego. There's way too much cargo coming into the country for customs to inspect everything, so a good percentage gets through. Drug cartels use the same tactics: send so much that what doesn't get rolled up is still profitable.
These guns are used by the US criminal class, organized crime, cartels, etc. And when they get a few bodies on them the gun is trafficked further East to other gangs or same gang/other members. It gets more bodies on it, etc. When it gets too radioactive, it moves South to Mexico, the Carib, then Central America, etc.
By the time it reaches some scrub entry level kid in a gang in Central/South America, it will have dozens of bodies on it. Each time it changes hands, profit is made by someone.