Usually, student or trainee status is required to be eligible for deferment of U.S. student loans. You should check with the policy of the individual program to be sure. Anyone with the job title Postdoctoral Fellow or Brittain Fellow at Georgia Tech has employee status (as this provides the employee benefits options).
Postdoctoral Fellows and Brittain Fellows do not have a trainee or student status.
Scholars who receive a stipend via a postdoctoral fellowship or training grant may have trainee status, depending on the policy of the funding agency. Most scholars in this situation have "affiliate" status in the Georgia Tech Directory.