I would assume that the person is a troll. I don't see them having any significant proof for such a significant claim.
I think it's really strange how the father of the minor went onto Reddit to discuss what happened. And somewhat naive if this is a significant FBI investigation.
I find it hard to believe they would enter a house with 20 armed agents to arrest someone who did not commit an act of violence.
America is a terribly strange and terrifying place to those that didn't grow up there.