I think the angel is in the wording:
The objective of the training is to reach the level of proficiency necessary to safely operate the relevant type or class of aircraft. The amount of refresher training needed should be determined on a case-by-case basis by the ATO, taking into account the following factors
In other words, there is no
requirement for the TRTO to administer the full rating courses. If you were to come back and be inducted in-house I would expect that the airline could use this to their (and your) advantage and complete the minimum company conversion in SOP and such: limited change to the current process. You would not, in this case, be in the same boat as fresh licence holders with no experience.