I wasn’t crazy about the name drop. Mostly because I can’t see how Luke even knows the name unless Yoda gave him a history lesson on Dagobah. And I can’t see Rey recognizing the name at all. Would even those tasked with writing the history books know a secret Sith name? I doubt the Emperor kept a personal diary that would be discovered after the Empire fell.
Some would grumble if Luke had said Palpatine, since that name was never spoken in the OT.