A professional using AI as part of your diagnosis is fine.

A professional using AI to diagnose you is not.

To put it another way. If I had a condition, and my doctor used and AI to look through thousands of studies to find a treatment regimen that fits my particular health profile better than the standard treatment and they then review the sources and decide that it would be a safer and more effective option than the standard care, then I'm all for that. If my doctor says "I asked this AI, and it said do this", then I'm definitely not doing "that" until I check in with another doctor.