Did you actually read the article? Because Valve clearly said it will not ship games that have AI generated content in it, as the legal ownership is unclear.
Quote article:
" … At this time, we are declining to distribute your game since it’s unclear if the underlying AI tech used to create the assets has sufficient rights to the training data."
Considering most AI tools can’t really claim to have legal rights to all their training data (and even if they do, it may still not be an ethical use of that data), this policy as stated basically amounts to a blanket ban on AI-generated assets in games.