Logline
Who knows? They never released one.
Edit: They finally released one - how novel to release the actual episode first!
Captain Freeman assigns the Lower Deckers an overly safe mission to try and keep a self-destructive Mariner out of danger.
Written by: It’s a secret (it was Mike McMahan)
Directed by: We’re not tellin’ (it was Brandon Williams)
Given the mention of Thomas Riker, I wondered if they were going to reveal that Locarno was a transporter clone and Paris’ dadmiral covered it up. But that would also mean Beckett kept quiet about it, and that seems like something she would have mentioned when they interacted with Tom Paris.
Secret information is shared on a need to to basis, not as background on a visiting officer.
She may absolutely know this.