We are aware that many modern game development environments have AI powered tools built into them. Efficiency gains through the use of these tools is not the focus of this section. Instead, it is concerned with the use of AI in creating content that ships with your game, and is consumed by players. This includes content such as artwork, sound, narrative, localization, etc.

What you linked is pretty clear to me. Tools and code are not “content”. That’s Valve’s intent.