The construction of the attachment of the fin and its movement is by the looks of it not a fail-safe design. So it must be safe-life and therefore time limited. Changing it at the safe-life interval is very costly, and probably prohibitive, so the aircraft must be written of. I remember many years ago that a small PZL aircraft (Poland) also had a safe-life fuselage (steel tube), and after so many flight hours, you were supposed the repalce the fuselage....