Shame they need to put up with that spam. However, every big open source project has by now had good contributions with "AI help". Many millions of developers are using AI a little as a tool, like Google.
In that sense, it has destroyed actual value as the noise crowds out the signal. AI could easily do the same to, like, all Internet communication.
They don't say it because the internet provides actual value.
And most contributions with 'AI help' tend to not follow the code practices of the code base itself, while also in general generating worse code.
Also, just like in HTTP stuff 'if curl does it its probably right', I'm also tend to think that 'if the curl team says something its bullshit its probably bullshit'.