For the purpose of this subsection, “employee” includes an employee of the government of the District of Columbia and an employee whose pay is fixed and adjusted from time to time under section 5343 or 5349 of this title, or by a wage board or similar administrative authority serving the same purpose, but does not include an employee or individual excluded from the definition of employee in
section 5541(2) of this title, except as specifically provided under this paragraph.