'Out of season' fruits are definitely readily available all year round for a couple of reasons. One is that a lot comes from outside of Australia,and the other is that a lot of wonderful fruits grow in our tropical regions almost non-stop.
I live in Nth Qld and we have farms where the strawberries are currently scrumptious and very cheap,as well as bananas,various melons and gorgeous sweet pineapples. Many so-called summer vegies are also available here .I even have tomatoes and passion fruits growing at home all year through. I do occasionally supplement these with cherries from USA if they are not too expensive as I really enjoy them.
Yeah, you can get more things out of season now. I suppose it's a combination of buying food transported from further away and different farming practices (breeding for frost resistance? More use of greenhouses? Not my field)
Like some supermarts say "the fresh food people" when garlic from China Mexico grapefruit
Israel and U.S. Orange growers ripping out trees so people can have fruit all year round I refuse to buy any overseas grown fruit we all should do,same as we did before and protect our fruit growers
Much supplementary fruit & veggies here comes from our own Ord Irrigation Scheme, outside of Kununurra, WA.