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Re:NixOS for the Impatient by abathur on Friday June 09, 2023 @04:55PM (#36264052)
They are likely talking about using https://github.com/nix-community/impermanence, which is inspired by ideas in https://grahamc.com/blog/erase-your-darlings/

Edit: comments on the latter at https://news.ycombinator.com/item?id=22856199

Re:NixOS for the Impatient by anotherhue on Friday June 09, 2023 @05:30PM (#36264402)
That's quite fancy, I use use a tmpfs mount for root and a few bind mounts for what I need to persist.

https://news.ycombinator.com/item?id=35390782