The thing with LP is that it makes your phone to bootloop. When it happened to me, since I didn't know how to enter safe mode, I think even uninstalling the app from twrp didn't fix it, so I made a clean install of the rom (I ~just had moved from stock to custom, so an extra reset ~wasn't a big issue). I've read that some others fixed the bootloop with a simple flash of the same rom ~without losing data (probably doing a factory reset wothout data reset would work as well). Your safe mode method seems even easier, but 1)will the phone manage to escape bootloop with safe mode and 2)will uninstalling LP actually fix it or will it leave files behind continuing the bootloop?