> which is published with the purpose of informing the public on matters of public interest
From your link, that's the only case where text needs to be attributed to AI.
> Providers shall ensure that AI systems intended to interact directly with natural persons are designed and developed in such a way that the natural persons concerned are informed that they are interacting with an AI system
That should be obvious considering an MR is not providing AI services.
> which is published with the purpose of informing the public on matters of public interest
There is no "informing public on matters of public interest" in source code nor an MR. It's clearly meant to prevent "deepfake" news, like the image and video ones explicitly call that out.
In other words, what AI service are you providing by creating a PR?