Yes, only include a type of nuclear reactor that hasn't ever been built, and don't include any other nuclear plant in the study. While we're at it, don't include the costs of carbon sequestration with the coal and gas plants.
Oh look at that. The government will use this study to show they must build more gas plants.
The report explains why they didn't look at large scale nuclear in section 2.4.4. You can download it here, but basically there are two reasons why the CSIRO and Australian Markey Energy Operator felt that large scale nuclear is not appropriate for comparison. Firstly the nature of our network precludes large scale nuclear - state networks are small compared to overseas networks, and if a single reactor powers a significant portion of a network's base load then it's difficult to shut it down for maintenance. Secondly costing reported by other jurisdictions may be inaccurate given government investment, and that capital may have already been recovered.
As regards sequestration I didn't have a thorough look at the report but it does discuss carbon capture and storage. Charts list costs as "CCS".