Has FSF actually said this? I don't see how it makes it a non-free license - the original intent behind the xGPL is to ensure that a user of the software also h

Has FSF actually said this? I don't see how it makes it a non-free license - the original intent behind the xGPL is to ensure that a user of the software also has the access to the source code, along with the knowledge of who created it (attribution). This is to protect our right to repair. So if any part of your source code is used by someone else, even by an AI system, to generate a software, it should also inherit the same viral property of the license - be licensed under GPL with attribution. If it does not, it is similar to a non-free software using your GPL code in the project, which is already prohibited by the license.