Reported that this is a targeted offer:
AmEx - 5,000 Qantas Bonus Rewards Points (for AmEx Qantas Cards)
They have been doing this with the $500 spend requirement for many months.Popped up again when logging in today so applied. Interestingly it came back with a "we will let you know the outcome of your application" rather than an immediate confirmation. I would have thought that there was little to confirm.
IIRC in past promotions there has not been spend requirements attached.