I have the PDF. It doesn't mention the sentence about which I have the question.
My guess as to what it means is the same as you wrote. However, I find that confusing. Why not just write the rule one way with precision? Either say that it is a line across the apex of the neckline or a line 1 1/2 inches below the opening of the neckline.
Having pictures of one while the other is in the book is confusing.
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