Notams are not used by RAA/GA pilots only. They are used by everyone, visiting pilots, international flights. Notams are standardised across the World. Some may never visit other countries, but if they do, the good thing the same English abbreviations (standards) would be applicable everywhere. Imagine learning e.g. French abbreviations ?
UTC is the same as GMT (Greenwich Mean Time, known by the borrow in London, UK), which is accepted as Universal Time and never changes regardless of local laws. To my knowledge WA, QLD don't have Daylight Savings, the SA is running in +30mins, some roadhouses along the Nullarbor are in +15mins offsets, so many local rules which I am not aware of.... but the great thing is the UTC/GMT never changes.
To move forward, I suggest start learning Notam/TAF aviation acronyms and learn adding +10, or +9:30 or +9:15 or whatever time difference is in your local state of residence. It is not that hard.