Yes, it’s becoming a popular place to visit. And I think they have a growing number of korean immigrants. Seeing Korean signs isn’t all that strange in the EU. Japanese and Chinese are common as well.
There’s massive numbers of Asian tourists to Europe. It’s like Disneyland to them, check all their Facebook posts. Some of them have more posts of Europe than their home countries.
When I was in New Zealand last year, most of the signs in air ports had Simplified Chinese along side English, just like those Melbourne signs you posted.
There are a lot of Taiwanese tourists in Prague as well. When I was there in 2016 I couldn’t turn without hitting a Taiwanese tourist.
Japanese signs are somewhat common but frankly I don’t see why at all. There are so few Japanese tourists in Europe. Even less than Taiwanese tourists. They’ve probably had them since when Japanese were the only Asian tourists like 30 years ago and never bothered to update.
I think I will also go visit and spend some money there. Prague’s mayor is pro Taiwan. He did his medical internship in Taiwan if I remember correctly.