Statutory and naturalized are two terms with different meanings. Both natural born and naturalized are citizenship defined by statutes made laws by congress. The law in 1970 will apply in this case.
Did you read the case?
I'll just leave that there.
I suspect you are firmly attached to that notion, and have a variety of rhetorical argument to sustain the position, such as "Congress has the power to make rules of naturalization, which includes the power to define what is not naturalization." I don;t think a discussion on the subject has any point. you've stated your conclusion, and that's that. Anybody who finds differently is just wrong, and that's that, too.
That's the condition of the argument, and it will never be resolved, except by consensus, which, as we know, is always right.