I think it's a genuine question and I don't see anyone saying that theme park fans or pages are wrong for being interested in this.
I do think it's an interesting topic because even other nearby VRTP offerings like Paradise Country, Australian Outback Spectacular, Wet'n'Wild Buggy don't get much mention in this community. Granted Topgolf certainly has more of an appeal to this audience than PC or AOS, but things like WnW Buggy seem like they'd be a fit too. Or the indoor go-kart joint just across the road that has a zipline coaster for that matter.
For what it's worth, the driving range at Victoria Park in Brisbane is modern, licensed, two levels and features (albeit unsophisticated) targets. They don't have the private booths or the technology which are obviously at the core of the social experience of Topgolf but I'd argue the fundamental concept (drinks and whacking balls at things with mates) isn't as novel as it might seem. Topgolf just package it into a very schmick experience. And it's American.
Ignoring theme park fans for a second I do feel like there's a cultural trend at play where Australians visit America once and then return to brag about the things they did and tried before their mates. In the same way that decidedly average US fast food chains like Taco Bell or Carls Jr are taking off here, I feel like Topgolf is riding the current wave of anything American to some extent. That isn't to say it's not a valid reason to be excited about it, but it's undoubtedly part of the bigger picture.
I'm looking forward to it because of how it aligns a number of my personal interests. Quality American food (hopefully), good beers (hopefully) and golf. Despite the proximity and ownership I don't see any inherent theme park connection.
That said it's been covered on Parkz a bit and I certainly plan to do more. If group events were our thing I'd probably be more keen for an afternoon/evening at Topgolf (18+, first round on us, no one's driving home are the rules) than say a day at a park.