however, most states require the adopted person to be at least 18 years old and may also require a court order before the original birth certificate may be released.
That isn’t exactly the most difficult task under the sun. Unless we are talking about Obama’s records.
The point being your claim that the original birth certificate is not amended unless the adoption happens near the time of birth.
not true, the original would be sealed even if 8 years old.
Would the government consider that an amendment? I don’t know the answer. What else would it be?