not sure what they mean exactly but there's a lot of the "paths circle back on each other" type thing going on. The levels have a wide variety of altitudes involved and there are caves and things to get to different areas.

There are also a bunch of references to earlier games, like there's a new londo type area at one point. You can tell in some of the character and boss designs they took inspiration (and even movesets) from bosses from earlier games. You can definitely see moves from Sekiro and DS3 in there, there are some DS2 influences as well that are more obvious than in the base game.