Doesn't necessarily mean Luke has credits. I mean, Ricky Reed, the executive producer of the album, has done songs for both Lunchmoney Lewis and R. City. So there's still hope
If she worked with him, she'd have revealed it in an interview or something months ago, like she did with Reed, R.City and Lunchmoney.
Prob just means she is avoiding naming him. I feel like she loves the songs she did with him too much to drop them but she is conflicted in naming him.
Anyways Ill wait for the iTunes credits for the full proof but the cryptic tweet of Jacob Kasher in his instagram gives me a hint Dr. Luke produced the track.
iTunes Credits: Meghan Elizabeth Trainor, Lukasz "Dr. Luke" Gottwald, Jacob Kasher Hindlin, Gamal "Lunchmoney" Lewis, Theron "R.City" Thomas & Henry "Cirkut" Walter
Just speculations.
I'll definitely buy it
TARGET EXCLUSIVE 
