Maybe the option should be "decide then based on info available if I should get vaccinated even though I have antibodies"
Good suggestion, but that is just creating more blurred lines. The big picture should be about immunity not administering a vaccine.
If you look at confirmed effectiveness (assuming when that happens) standpoint.
Having antibodies that are proven to give immunity is same as being vaccinated and that should be the appropriate answer.
Having antibodies that are not (yet) proven to give immunity is same as not planning to get vaccinated and that should be the appropriate answer.