Incorrect. It is textualist/originalist to read and interpret the entire Amendment, as well as anything else that would explain the writer’s intent. At the time it was written it was perfectly understood that it pertained to the Civil War. The men affected by it were well known to have been associated with the Southern war effort. They didn’t, nor could they, deny it. Even so, enough controversy arose that Congress found it necessary to write a statute the next year. A statute that the Colorado court ignored. I believe that when the Supreme Court deals with this case it’ll be said to be textualist/originalist, and will go against the Colorado court, and you.