If they weren't bluffing and you're in the same county, it could just be the dispatcher remembered you from last time.
I had something analogous to this where the local PD left a voicemail saying my brother had gone missing and left a name with the same last name and a name similar to mine.
When I called back, I told the dispatcher and they refused to leave it there and wanted to transfer me to the cop in question which I thought was really weird. He took it down but it seemed like there was something else there. And I realized he was probably fishing to serve an arrest warrant or something.
To see if I would go, "No, my brother isn't missing. That's my cousin and he's at <address>." Cops do that type of shit all the time.
really just sounds like a cop telling a small lie based on your reaction in an attempt to spread good PR on behalf of the police all the while establishing a position of authority, unintentionally making you think there's darker forces at play then there really were, when in reality he was just defusing the situation with a lie. obviously one can't know for certain but that seems like the most plausible explanation. I can see this being an informal personal technique a cop might use in situations like this, all the while being completely oblivious to the terrifying implications of what he's saying.
I doubt there's any way to ever prove what happened here, but this is what I was thinking too. It was a lie to cool things down. Someone who's angry to the point that they're yelling is dangerous, not just to the cops but to other drivers on the road.
