Such good questions. Thank you for checking.
A scoop really isn’t required. Weighing 12 g works. You should get 72, which when sandwiched would make 36 completed cookies. The blueberry reference is confusing. The size of 12g here was closer to a large globe grape. When flattened the cookies are 1 to 1 1/2 inch in diameter.
does that help at all?