Pretty much in title.
"This bonus points offer is not available to existing customers who have received or are entitled to receive NAB Rewards Bonus Points for a new personal NAB Rewards credit card or NAB Home Loan in the 18 months prior to the opening of a NAB Rewards Signature Card or NAB Rewards Platinum Card."
This tells me i should be good - but still not 100% sure and wante dto double check.
Yes, you are good to go.