Hi 231081
The tub Stork contains a small amount of buttermilk which renders it non-vegan. The block stork does not contain buttermilk and is therefore fine for vegans. As far as I know, this has always been the case for many years.
I feel the best thing to do, is check with the manufacturers of this product to get the definitive answer. They can be contacted by using the following email:
https://www.bakewithstork.com/contact-us
I do use the block sometimes, which is vegan. First, I beat room temperature stork with sugar for several minutes. This helps to incorporate the air needed to create light, fluffy cakes.
Hope suggestions help 🙂