Rubbish, I have spoken to the Tobago pilot on several occasions. He heard the jet on both the area and the tower frequencies, had the jet in site at all times and stated to the ATSB that there was never any chance of a collision.
The only reason the TCAS RA recorded was because NAS 2b introduced mandatory transponders for the first time for all VFR aircraft in the airspace above Launceston.
The RPT crew never sighted the Tobago so if the pilot had flown in exactly the same place a month before without a transponder and un announced no incident would have been recorded.