The only way I have been able to disable Apple Intelligence is by
applying a restrict Siri app and this completely disables access to AI.
I still get prompts for it but cannot configure or use it.
I am having the same problem with my test MacBook pro. I suspect that
once Jamf Pro 11.12 comes out, we will have more advanced options to
disable AI. We need to disable AI due to HIPPA compliancy.