They have not, they do accept AI contributions, however their policy is a bit more restrictive than Debian's in that Fedora at least requires contributors to disclose LLM use in pull requests.

There are a few distros that do reject all AI code, which you can find in these two lists:

https://noai.starlightnet.work/list.html

https://codeberg.org/ethical-foss/open-slopware#linux-based (under the 'Alternative Linux-based operating systems' section).