Error in the new episode?

In the recent episode (season 7, episode 3), when Nolan was searching for clues on the computer in the station, he sees Smitty’s end-of-day report. On there, you can see that it say “Lt. Wade Grey”. Then the next scene shows Nolan asking Smitty about the report from last year.

So we know Grey got promoted from Sargent to Lieutenant after the finale of season 6 but were the events a year ago in-universe?