“(I think we are seeing a replacement birth certificate which was created for an adopted child.)”
The one they posted couldn’t have been created pre-photo shop.
This is true. They just used more modern tools to do what they have always been doing.
I am an adopted child, I have a birth certificate which was created 6 years after I was born. It was fabricated using pre-photoshop technology, and it contains the same Doctor's signature as did my original.
A lot of people simply do not understand that seeing a birth certificate that is not sworn to be an "original" is not actual proof of birth. It is only proof that a state legally recognizes an individual per the document.