This is a longer video about the how they "flatted" the earth using a dymaxion-like conformal projection. The good parts start about the 4min mark.

https://www.youtube.com/watch?v=0eyyuNvKNzw

In the video they mention that it’s creative mode because it would be too hard an endeavour in survival mode.

> How does it deal with spherical topology while keeping the 1m^3 block size?

The earth is flat, haven't you heard?