That seems an accurate understanding of Levin's definition.
Frog's definition: The term NBC as used by the founders cannot be defined by what the founders' DIDN'T say ("if they had intended that, they would have said it") rather, by what they did; i.e., by how they edited the language to exclude any other definition.
1. With reference to the qualifications for president alone, after further consideration they removed from the proposed draft the single word "citizen" and replaced it with the more exacting term NBC. Why would they have done that? Jay's letter provides the reason.
2. After even more consideration, they added by amendment the condition that ANY citizen was qualified for the presidency so long as they were alive at the time of adoption of the Constitution. Obviously, they realized there could be no NBC candidates until sometime after adoption, that only if born after adoption could one qualify as a NBC.
So, regardless of whether there were any other definitions that may seem applicable, we know exactly what the founder's intended and sought to achieve.
Jay’s use in 1787 of the phrase “None but” in conjunction with the already known and used term natural Born citizen (Adams in his role as plenipotentiary minister if the U.S. used it in drafts of the Treaty of Paris circa 1782-1783) would seem to suggest a great deal more exclusivity than Levin is willing to admit.
As in, the maximum level of exclusivity.
s in, at least one generation’s worth of buffer between the person being born and any potential heart-string-plucking foreign influence or residual affection.
As in, as this commenter had grown fond of saying, a plain vanilla U.S. American. Zero exotic flavoring.