There may be something wrong with the application process.
Following the provided link you get to this page:
NAB Credit Card Application
On that page there is only one card to select:
'NAB Qantas Rewards Signature Card'
But I get the following message even when I select the only card available:
'
Please note the following important information:
- Please select a NAB credit card from the list below. If your preferred card is not listed below, please go back to nab.com.au/creditcard and start again. We apologise for any inconvenience caused.'