These bags of flour might be usable for baking but due to their dates they are being offered as flour for crafting. They have been stored in a pantry that is dry and in non-smoking environment.
https://www.bbcgoodfood.com/howto/guide/how-make-salt-dough-recipe
https://www.yummytoddlerfood.com/the-best-salt-dough-ornaments/