I feel like JE wouldn't be dumb enough to do this if he was mafia, so I doubt he's lying...
But then again I doubt anyone would just straight up tell a non-mafia that they were mafia.
Two scenarios, both of which JE is famous for:
1. JE's screwing with us. Most likely scenario, probably about 90% chance of this.
2.Mafia are setting up a sacrifice. 10% chance of this.
I'll reserve my judgement till later.