Wikipedia article on Starch explains:

As the videos below illustrate, starch is extracted by wet grinding, sieving and drying. The sieving step converts a whole food into an extract by separating starch (in the form of a starch rich liquid) from the original whole food. When this starch rich liquid is allowed to sediment, starch settles down at the bottom.

Are starch extracts used in Whole Food Plant-Based recipes? Yes, in a few recipes; in small quantities. What role do starch extracts play in such recipes? Wikipedia article on Starch explains:

Nutrition Studies: Blueberry Oatmeal Crisp and Old-Fashioned Fig Roll Cookies.

Dr Fuhrman: Arrowroot powder is used in these recipes: Broccoli Quiche with Aquafaba and Vanilla Nice Cream with Raspberry Sauce.

Dr McDougall: Cornstarch or arrowroot powder is used in several recipes. For example, Chocolate Fruit Fondue, Enchilada Strata, White Mushroom Sauce, Mediterranean Mushrooms, Heavenly Vegetable Soup, Marsala Mushroom Sauce, Mushroom Gravy, Spicy Mexican Sauce, and Lo-Cal Stew.

Even though starch extracts like cornstarch and arrowroot are used in some WFPB recipes, I choose to avoid adding them to my meals because they are extracts, not whole foods.