blanket yes with an added ^ re: Asch's comment because tfw "flesh eater" is a colloquialism in your world but has nothing to do with actually eating flesh, it's just a way to refer to stealing someone's heart and inserting it in your own chest (via magic bullshit mostly), and yes the heart stealing is called heart eating, etc, etc.

Jade himself is a flesh eater so there might be overlapping jokes (especially since Jade will joke that he actually ate the heart even though he definitely did not) but also mild confusion.