Other fps game maps don't have licenses that let you use them to stress test your renderer or game engine. Existing freely available scenes are all too small and poorly made to be proper stress tests with modern hardware (eg. Old sponza is way too light, Intel sponza they just spammed the subdivision modifier to make it stupidly high poly, Bistro is small and really weirdly made, etc).
Not that it makes it novel, but this appears to be a “battle royale” map based on the picture shown in the post. So it is fairly large, for whatever that’s worth.
The assumption with this type of game is that player will play the same big map over an over for the season (or something like that, changing the map is very rare, might not happen at all over the lifespan of the game), and but they can pick which part of the map they start in and explore from there. So it is, I guess, more similar to having data from all of the maps, for classic first person shooters.
Specifically, during each play session, the map has a "storm" which converges on a random location over time: staying in the storm is lethal, so you are forced to eventually go to that location and points-of-interest along the way, which adds play variance.