I've learned not to look that deeply into what people say as it's mostly a reflection of themselves. Honesty's an attribute of the truly brave- a privilege of the very few.
Contacting the New Republic leaders, Emperor demands the presence of Leia and the return of his Jedi holocron, and promised to discuss a truce with the Republic.
Leia complied to the Emperor's demand for her presence, but left the holocron behind.
Thanks to her, Luke managed to shake off the shroud of the dark side completely and turned on Palpatine.
I'm quite sure everyone has noticed by now that Emperor's comeback in episode IX is a complete rip-off of Dark Empire comic series. Just read this series and you'll see some similarities to episode IX.