In this case flourless means a lot of ground nuts, some cornmeal and cornstarch, oats—both rolled and ground—and lots of egg whites for lift. No gums. No custom flour blends. Has refined sugar, but also some recipes with maple syrup or honey. Spiridakis discusses substitutes for butter, milk, and eggs, but warns that when eggs are used for lift there's no substitution. That leaves a number of recipes that call for cream or yogurt, but no word on replacing those.
So, not exactly flourless, but close. It's a cookbook that mostly uses nut flours or pastes for bulk, so that's the cakes, cupcakes, cookies, and tarts, but it also does puddings, custards, mousses, meringues, and candies, which of course are heavy on the dairy and the chocolate.
Each recipe has a description so you know what the finished product will be like, but only about half have photos, which is a shame because they make the food look very appealing. Measurements are in U.S. volume and grams. Cookies and candies always have storage advice, but it's rare in other chapters, and the index is very good.
A little heavy on nuts for me, and the chocolate chip cookies are mostly powdered sugar and egg whites—so a meringue—but this is a nice book with range that does classics as well as some showstoppers, like the opera cake on the cover.