Originally posted by DominisThat was definitely the implication. 👆
I've not read a lot of the extended ROS material(other than what you and others have posted), but didn't the movie seem to imply that his spirit can only leave his body by latching onto another who embraces their hate by striking him down? Otherwise he seemed pretty stuck with his broken down body and doomed without it, which is why he needed Snoke to carry out his plans.
I'm just saying that because transferring his spirit into another vessel was part of Palpatine's powerset in RoS, there could still be a possibility that having his physical body destroyed didn't perma-kill him. His spirit could still be lingering in limbo, just waiting to inhabit another body.
Palpatine did state that he had "died before", after all... /shrug