No, LEGO Star Wars 75280 501st Legion Clone Troopers hasn't retired in Australia
LEGO Star Wars 501st Legion Clone Troopers 75280 Building Kit, Cool Action Set for Creative Play and Awesome Building; Great Gift or Special Surprise for Kids, New 2020 (285 Pieces) : Amazon.com.au:
LEGO Star Wars 501st Battle Pack COMPARISON! (75280 vs 75345 | 2020 vs 2023) - YouTube
LEGO - 75283/75280 - Lego Lego Star Wars AAT en 501st Legion Clone Troopers - 2000-2010 - Catawiki
LEGO Star Wars #75280 501st Legion Clone Troopers Battle Pack - NEW, In Hand | eBay
LEGO - 75280 Star Wars 501st Legion™ Clone Troopers – Alfy's New & Vintage Toy Shop
5 x Star Wars LEGO Clone Trooper Head / Face Minifigure Parts 75280 75
LEGO Star Wars The Clone Wars Minifigure - 501st Legion Clone Trooper with Blaster (75280) : Amazon.com.au: Toys & Games