I definitely think that this 1971 visit had something to do with getting Barack jr's records straight (in "Dreams" he talks about seeing his birth certificate during that visit).
Just up the thread it was determined (if "Dreams" is accurate, although you did say upthread that no one should believe any of it) that he saw the birth certificate and vaccine forms when he was in high school. He wasn't in high school in 1971.
You are right. Going by the birth date we have for him, he was 10. Good catch.