It depends on your perspective. Some parts of the story might be based on real events or inspirations, but it's likely a fictional creation with elements of imagination.
Yes, Ferdinand is loosely based on a children's book of the same name, which might have been inspired by real-life events or concepts, but it's not a direct retelling of a specific true story.
It could be that the story of Ferdinand was banned due to concerns about its message or potential influence on readers. Maybe it was seen as inappropriate for the targeted audience or went against cultural or moral norms.
The story of Ferdinand the Bull centers around a bull who stands out from the rest. He doesn't fit the typical aggressive bull stereotype. Instead, he enjoys the simple pleasures of life and refuses to be pressured into conforming. This causes quite a stir among the other bulls and the humans around him.