The language is actually: > Any contribution of any LLM-generated content I read this as "LLM-generated contributions" are not welcome, not "any contribution

The language is actually: > Any contribution of any LLM-generated content I read this as "LLM-generated contributions" are not welcome, not "any contribution that used LLMs in any way". More generally, this is clearly a rule to point to in order to end discussions with low effort net-negative contributors. I doubt it's going to be a problem for actually valuable contributions.