I think where people are getting mixed up is LE has had this video since the very beginning. Surely they investigated who "Adam" was and spoke to him. Maybe he's not of interest, maybe he is.
But we are not the first people to see this video. The Fox article says it was provided to LE weeks ago and the Facebook busybodys were upset that LE did not release it to the public so they did.
It tells LE nothing they didn't know a few weeks ago. It "breaks open" nothing because LE has had it for weeks.
It is, of course, a new topic for discussion here because it is in MSM now but that doesn't mean everyone's going to agree on the probative value.