Yeah, the ST has made it 2/3 of the way through without referencing anything about the OT that’s version-specific.
Was there ever any truth to that rumor from two years ago about Hayden as ghost Anakin showing up in TLJ?
Nope. Johnson has mentioned that he basically decided against the possibility completely as soon as he thought of it. I think the rumors started from a piece of concept art from TFA. But even then it was never seriously considered - the concept artists always come up some of their own ideas during development that sometimes get worked in, but that piece never made it past that one artist’s rendering as far as I can tell (well, I guess it ended up in the Art Of book).