So there is

1. 100% plant based food, labeled for example "vegan sausage"
2. 100% plant based food, labeled for example "sausage"
3. X% meat based food, labeled for example “meat reduced sausage” or "sausage with added vegetables"
4. X% meat based food, labeled for example "sausage"
5. 100% meat based food, labeled for example “sausage”

Personally, buying 2 or 4 I’d be surprised that these products contain plants. But I fail to see how 1 and 3 would surprise anyone anymore. “Vegan” and “vegetarian” are terms I’d expect any adult to understand as “does not contain meat/anything from an animal”. So, calling anything “vegan sausage” clearly communicates that it is “vegan food in sausage shape” or “vegan food that is intended to replace sausage”.

No one in their right mind would think of olive oil as something to lubricate some olives…