It’s not about specific offending portions, it’s the principle of having any LLM contributions at all. There’s a group of people who are so opposed to this stuff that they object to its mere presence anywhere.

The issue with that stance, practically speaking, is that anyone could have hand-submitted generated code at any time, so why this January cutoff date?

I would expect a decrease in code quality in a specific part of the repo or at least a quote/link to a changelog stating that generated code is being used as part of the fork making its case.