Finished Dark Souls Remastered like a month ago, I even platinumed it.
In all my 50hs of the game I never came across any info on the dlc area.
There wasn't even trophies for it so I completly frogot it even had dlc.
But now after randomly watching a stream yesterday I remember it indeed had dlc. So I looked at a guide for how to enter it (imposible to know otherwise) and finally played it.
It took me less than 3 hours to fully complete it, so kind of dissaponitng.
There are some cool lore bits of information and the bosses are decent, but the areas are just reused areas from the main game and the finale after beating the final boss is a nothing burger.