sounds like fanfic.
In practice, this is a total conversion for Fallout 2, reshaping the isometric classic with new characters, quests, story missions, weapons, and items based on what the Fallout community has learned about Van Buren over the years.
Isometric with 3d graphics. There was a tech demo leaked, you can go play it: https://www.nma-fallout.com/resources/van-burens-technical-demo.71/