But they aren’t, vegan shoes would be made of polyester/nylon/other plastics.
They’re usually not, at least at this time. More R&D needs to go into plant-based materials for more options. Even so, leather itself is also anything but “organic.”
The one in the post looks like it’s polyester and foam. Why would plant based materials be better? I would think ideally you’d make the plastics out of ethanal and algie, but with how much processing goes into it, I’d hardly call that organic.