Biodynamics originated in Europe, it is ancient apparently and Rudolf Steiner re-discovered it through spiritual investigation. I understand it could be seen as a contradiction, and vegetarians are sometimes attacked over these apparent contradictions, kind of like some folks like to catch us out. I am vegetarian, I don't eat animals, I do have dairy.
I don't eat deer bladders, but I will eat the vegetables that are grown from the compost made within the bladder.
I do what I can, I have leather work boots. I think perhaps a vegan may have an issue with bio-dynamics. It's a fine line with bio-dynamics, but because I deeply respect Rudolf Steiner, who was also vegetarian, I accept this method.
I do not have a problem with your questioning by the way Heart on Fire, I am 100% happy with what I am doing with my diet. I am always interested in learning.
peace