Is there a link where it states that Apple expressly forbids algorithmically created Atmos mixes? I googled it and nothing comes up.
I have seen it and links to it have been posted, but I don't have the search skills (and time) to find it right now. I'll track it down later if no one else does. It was some Apple document aimed at content creators, not really a public statement.
Here is at least another reference to the policy... How-To: Apple Spatial Audio Explained - Mixonline