That doesn’t sound like a death threat.
Sounds more like a “needs” to happen, not a threat to happen.
I can’t post the death threats here because they contain a good amount of profanity. Just google the nitwit’s name plus “threat,” and you’ll find them.
Still not a direct threat, but maybe enough to investigate.
But that doesn't mean the FBI should be co-opting someone else's organization. The question in my mind is did they have permission to do so. Even with a warrant I don't think they are able to pretend they are from Patients United Now without their permission to do so in the investigation.
That's a threat.