Yes that jumped out at me straightaway. Why would Lorca say that to Burnham? Some possibilities:Welcome home ?
- It is simply the old "editing trick" thing where audiences are led to expect something because the line has been taken out of context. It's something totally innocuous like Burnham having discovered her MU counterpart's quarters on the ISS Charon and Lorca finds her there.
- Lorca, for some reason, actually believes Burnham to be the MU Burnham. (She did mutiny, after all).
- The latest twist - Burnham has ALSO been the MU version all along (totally dumb IMO and doesn't even bear serious consideration - would kill the show stone dead)