Looks like ANZ have moved to a 24-month exclusion period, mirroring Westpac. They've also closed off the loophole of the FF and Rewards cards having separate exclusion periods.
https://www.anz.com.au/personal/credit-cards/frequent-flyer-…
"You are not eligible for this offer if you currently hold or have held an ANZ Frequent Flyer or ANZ Rewards credit card in the last 24 months."
Tough life for churners these days