IIRC, Vader’s home does exist as some old pre ROTJ concept art.
Yes, Vader’s castle makes its first appearance in Leigh Brackett’s original screenplay for ESB. They also made at least two pieces of concept art for it during ESB preproduction. They’re actually really cool and I’ve wanted to see Vader’s castle in official media since I first say the concept art back in the 90’s. I think it was in The Art of The Empire Strikes Back.
I’m happy to say, the interpretation of the castle on display in Rogue One did not disappoint!!