A matter or thing done or omitted to be done by the Secretary, the Registrar-General, an investigator, other authorised officer or any person acting under the direction of the Secretary or Registrar-General does not, if the matter or thing was done or omitted in good faith for the purpose of executing this or any other Act, subject the Secretary, the Registrar-General, investigator, other authorised officer or person so acting personally to any action, liability, claim or demand.