This seems to be a great deal!
With Snapdragon 636, it is definitely worth the $50 upgrade from the Xiaomi Redmi 5 Plus.
Although, I am quite skeptical on it's legitimacy. The website specs shows that this phone has a Snapdragon 625 and looks nothing like the photos.
Don't forget cashback!
your exchange rate is off.
gold colour is $180 USD = A$234ish. take off few dollars for aliexpress coupons amd 10% cashback, and you got yourself around A$215 phone