The conditions of the current offer state:
"Important information if you apply for a NAB Home Loan between 2 May and 31 July 2016.
[FONT=&]This offer is not available in conjunction with any other offer, including the NAB 250,000 Velocity Frequent Flyer Points offer. If you apply for a new NAB Velocity Rewards Premium Card, your 75,000 NAB Velocity Rewards Premium Card bonus points will be awarded within 3 months of meeting the eligibility criteria. If you also apply for a NAB Home Loan between 11 April and 31 July 2016 and meet the eligibility criteria for the NAB 250,000 Velocity Frequent Flyer Points offer, you will only receive 175,000 bonus Velocity Points (meaning that in total you will receive 250,000 bonus Velocity Frequent Flyer Points). If you apply for a NAB Home Loan and are awarded the 250,000 Velocity Points, you will not receive the 75,000 bonus Velocity Points as part of the cards offer."
Given the loan was in Feb, according to these terms, you're fine. Still a risk, but I reckon you would get the poitns after a complaint if they didn't come through automatically.[/FONT]