@BigSkyRider I would think it would be obvious.. you said "if it provides no additional protection, do we still have to call it a vaccine"... then you provided an image with no relevance to anything showing that COVID, like all vaccines, work by giving the same protections as catching the disease... Ignoring the fact that yes, it still protects you, if you never got the disease it is a way to be protected without getting the disease (duh!).

Hope that clarifies it for you.