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Read: write your PR. It doesn't say "do not contribute code touched by LLM".
It asks to take accountability for the thing you submit.
Technical output written by LLM is often very hard to read due to the ticks, fillers, fluff and idiosyncrasies. Even with rules or guidance.
This contribution rule ensures crap will be edited out and only the valuable content submitted. Cleaned up LLM code can be very valuable.
Developer gets it.