Yeah it's prolly a new name that he got once he was unforgotten or something.
I wonder if Drangleic was banished to the Dreamland or something.
Again, Old Intro Lady, Shanalotte or not, says "Perhaps you have seen it,
maybe in a dream". There's of course the tree in the intro, filled with fireflies -which I hear in some japanese traditions represent dead soldiers/people-. This will be important later.
Then the intro shows that you are dragged into a typhoon into the reflection of the lake, which is probably Majula. Then you wake up in the weird gazebo in Things Betwixt. Things Betwixt is full of trees, mostly giant trees.
Then you have the description of the Spirit Tree Shield and the Grand Spirit Tree Shield.
Spirit Tree Shield said:
A shield with a blue relief of a spirit tree. A rather well-built shield decorated by the spirit tree that appears in the allegory of Quella, god of dream.
Grand Spirit Tree Shield said:
Shield of the blue spirit tree that and is said to possess divine powers.
Appears in the allegory of Quella, god of dream, and can deflect spells by parrying.
Once there was a boy who was easily frightened, until the talking tree of the dreamworld transformed itself into a shield to protect him.
Here's the shield and the grand shield, which have the eponymous tree drawn on them. Each has a different tree painted -which indicates these are not really the shield of the legend, just reproductions of the legend-.
Then there is the mysterious tree engraving in Drangleic castle. It has a different shape from the trees in the shields, but it doesn't matter, cause the trees in the shields differ from each other too.
Ok so obviously the two shields represent the same tree, but maybe this is a different tree? There's a hint it is not. In the Farfire website, this tree is used to represent the amount of dead people, with an overlay of glowing masses, like the intro fireflies. So at least this is the tree from the intro, and maybe the tree of dreams.
And finally, you have the new message you can write, that was not present in Dark Souls 1 or Demon (thus "new").
"Like a dream".
So you have a dream talking tree, trees you can enter the memories of -trees that are really "slumbering giants"-, a symbol of a tree in a prominent place in Drangleic Castle, and the message comparing places to dreams. And the fact that Drangleic can be seen in dreams.
So maybe the ex-Lordran was vanished into the dreamland, where Vendrick can finally reach these new giant/tree beings that go into slumber like the dream god. Maybe it was vanished there to protect the rest of the world from the curse, maybe Vendrick sent Drangleic there in purpose.