The article misses the point that LLMs are not removing the bottleneck of writing code for people who know how to write code. It's removing this bottleneck for everyone else.

Is it safe to blow up a nuclear plant? Doesn't that cause bad things to spread?

Interesting, I’ll try to repro! For clarity, each “derivation” (lets say package) builds in its own hermetically sealed filesystem with its own dependencies. So conflicts in build system configuration shouldn’t be possible unless those packages are doing something impure (unlikely since the Nixpkgs CI tests for it) or the end user is doing something impure (still really hard to do).