I have such mixed feelings about "gender flipped/swapped" as book descriptors because these books almost are never by or about transgender/nonbinary people. At the end of the day, it still feels like reinforcing a binary.

Like why can't we say "subverted" or a "twist"? Oh yeah, because "gender swapped" is a commercial approach ala "girl in pants" that was developed by the cis gaze and cannot fully escape from it because it sells to a cis audience.

I also am not in a space to give folks examples or further educate on it.