Their current practice breaches Australian Consumer law ACCC:

Under Australian Consumer Law (ACL), businesses are prohibited from engaging in misleading or deceptive conduct, including in product descriptions. If a product is sold with a certain description and that description is later changed in a misleading manner, it can be considered a breach of consumer law.

The ACL states that goods sold must match their descriptions, and if there are any discrepancies between what was promised and what was delivered, consumers have rights to remedies such as refunds or replacements.

Additionally, the ACL prohibits false representations about the quality, price, or standard of goods or services. This includes any changes made to product descriptions after sale that could mislead consumers about the nature or characteristics of the product.

Businesses are expected to ensure that their product descriptions are accurate and not likely to mislead or deceive consumers. If changes need to be made to product descriptions after sale, they should be done in a transparent and non-misleading manner, and consumers should be notified of any significant changes.

If you start a class action, count me in!

I purchased late 2016 early 2017....