I am on the same boat. Somewhat similar thing was already done by those forensic sketch people that drew how a person might look like after x years if they had earlier photo. It’s not like those sketches meant they are irrefutable proof, just a method to potentially find what you are looking for and then investigate further.
That said, this feels like grasping at straws. I cannot fathom how with only DNA sample you could get an accurate portrait that face recognition could then match.