Here's the confirmation on the 80%

https://na.finalfantasyxiv.com/lodes...3e7ccabefa9954

Redeemable from the Resident Caretaker
80% of the price paid for the estate grounds.
There's nothing that has been posted since to say the amount paid after auto-demo has changed.

I suspect they don't refund more of the purchase price when relocating to deter people from relocating constantly (but that's still just a guess).

Misinformation is always going to exist on forums when players rely on each other instead of trying to look it up from official sources.