re: Why do people keep calling it a vaccine?

Cambridge definition:

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a substance that is put into the body of a person or animal to protect them from a disease by causing them to produce antibodies

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Merriam Webster definition:

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a preparation that is administered (as by injection) to stimulate the body's immune response against a specific infectious agent or disease

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CDC definition:

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Vaccine: A product that stimulates a person’s immune system to produce immunity to a specific disease, protecting the person from that disease. Vaccines are usually administered through needle injections, but can also be administered by mouth or sprayed into the nose.
Vaccination: The act of introducing a vaccine into the body to produce immunity to a specific disease.

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I am not certain that using the body’s cells to produce the antigen for immunity falls outside of any of these definitions. May I ask what dictionary your legal definition is coming from?