Not sure. I just don't see any reason why you wouldn't have far better growth with your previous procedure. It's uniformly poor, as opposed to being patchy or anything. This suggests to me that there might be a more fundamental issue impacting growth, but I'm certainly no doctor.
If it were me, I'd ask my primary care physician about it and follow their advice, including running any tests or ordering bloodwork as they see fit. Get as much information as you can, you know? Good call on speaking with a dermatologist, by the way. Perhaps get a second opinion from another dermatologist who knows more about hair and hair transplants.