HTC One M9 google pixel launcher experience app removel My HTC One M9 with Android 7.0 will not allow me to uninstall an app which is flashed by TWRP Recovery. Actually its a google pixel launcher experience app by XDA forum.
You have made it a system app by flashing so you can not uninstall it via conventional methods. If you are a rooted user then you can remove it via this system app remover.