I wouldn’t bet there wasn’t animal product in that bread.
Vegetarians, like all folks, come in all stripes. I have a friend that is vegan and would argue over a plate of pancakes (with no butter) that they NEVER eat any animal product. I’ve also seen this person eat jello. Guess they don’t cook much.
Truth is, if you are eating something someone else made, you don’t know what you are eating.
To mix the dough the Bakers would pull up the trousers kick off their clogs, stomp the dough to the proper consistency.
Because sour dough takes forever to rise they would wander off drink and raise hell, come back stomp down the risen dough and then shape it, proof it then bake it.
Remember in the oldies you only bathed on Saturday, contributed to the strength of the barm,