They're definitely overselling the complexity.
The story is linear, and there are only two endings. They each have an extra scene with your LI of choice, but by no stretch of the imagination can that be called "multiple endings".
Is the old version permanently taken down, or will it become available again once the new is released? What about the DLCs?
I bought the game just a few days before it was taken down, and didn't get around to downloading/installing the DLCs before they were gone...
Like most fans I'm definitely exited for the ReVamp, but I also love the old version and will be sad to see it erased completely.