I think my first reaction to this recipe was similar to my first reaction to the mayonnaise cake recipe, it doesn't make sense until you think about the ingredients.
Bisquick is flour, corn starch, baking powder, dextrose, vegetable oil, sugar, salt and monyglycerides. Except for the monoglycerides they're all things that a cookie recipe might use anyway.
Somehow I always thought of Bisquick as a buttermilk mix, but according to the label there's no buttermilk in it.
I spent several months a couple of years ago working on perfecting my biscuit-making skills before my wife finally admitted she preferred Bisquick. But we haven't made it much since going on the keto diet, so at some point I'm going to try the keto biscuit mix I referenced in a recent thread, but summertime isn't exactly biscuit weather.