Kevin,
Your information is incorrect. The answers you provide to the questions have nothing to do with how long you have been symptom-free.
Rather, your answers have to do with the time period the particular question is inquiring about, ie, "Within the past 10 years, have you been treated for, had any symptoms of, treatments for or told by any physician that you have or had cancer? If yes, please provide all details."
Obviously, if you had treatment for some cancer five years ago you must answer this question 'Yes' and provide details; you cannot answer 'No' because you have not had symptoms for the last 2 years.
If, on the other hand, your cancer was 13 years ago with no treatment or symptoms for 11 years, then your answer would correctly be 'No'.
Joan L