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Did they reinvent "wave function collapse" (https://github.com/mxgmn/WaveFunctionCollapse)?

No. WFC is fundamentally different from this.

Indeed, but it does serve more or less the same purpose in procgen pipelines (and folks have tweaked WFC for infinite worlds before[1]).

WFC?

WFC = Wave Function Collapse

Whoa this is awesome, thanks for the link!