But then why does Palpatine seem to gloat as he describes Darth Plagueis not being able to save himself from being killed? Shouldn’t he just be Plagueis?
True, but we never really see the event between Plagueis vs. Sheev Palpatine unfold only what we hear Palpatine retells to Anakin. Its possible to think things went down somewhat diffently to how hes retelling it to Anakin, and that gloating face could well be Plagueis reliving the event in his head of how he ended up posessing Sheev.
