THAT was originally a directive to a limited population for a limited time to stave off malnutrition issues. Religious leaders of various kinds have done similar things in the past. Some rabbis in the 1930s-40s advised their people to eat pork to avoid starvation when it was all they could get.Makes as much sense as beaver tail being 'fish' for Lenten dietary purposes.
As I recall, you’ll find similar dispensations for whale & seal.