I agree it's confusing in the title, but in context in the article it's more clear that the researchers call it "vegan spider silk" to capture their intention o

I agree it's confusing in the title, but in context in the article it's more clear that the researchers call it "vegan spider silk" to capture their intention of creating a material with the properties of spider silk, using the same structure that makes spider silk strong at a molecular level, but using raw materials that can be sustainably derived from plants.