Invincible aerials from ledge are already godlike and used extensively in every single game, and the risk/reward of “ledgetrapping” someone who is holding ledge is not worth it.
The best course of action is to run back to center stage and let your opponent back on stage for free, because otherwise you will sometimes just die at 36%
https://www.twitch.tv/collisionseriestv2/clip/AlluringSingleDadPraiseIt-oPI9Qoys_psfdtrw