Thank you for posting the PM, Mickey.
Taken in its entirety, I understand how it could be construed as a threat, IF WHAT HE SAYS IS IN FACT TRUE.
Basically it's a Sicilian thing: "You insulted my woman, so the men in her family must come at you to remove the stain on her honor."
Redietz has long claimed to be "connected," i.e. to have mob associates; does he?
Who knows?
Is his woman from a mob family with vengeful family members?
Who knows?
Not sure I'd construe it as a VIABLE threat, however given the battle you guys have been having I can understand how you might consider it a "gotcha" moment.