From an Australian point of view, Top Golf is a totally new leisure activity, tying the marketing to the theme parks would just hold it back. Top Golf isn't a theme park nor should it be marketed as a something to experience with the theme parks.
Also for most people, nothing on it's own is the motivator when it comes to travel, tourism is a 'critical mass' sort of thing. People don't travel to the Gold Coast for just the theme parks or the beach or the nightlife or Outback Spectacular or the shopping or any of the other attractions dotted through Surfers, they travel for all of it. Top Golf is something else to add on to the pile of 'Well I've wanted to go for ages and now I want to go more', tying it to just one thing would be foolish.
The other thing is that it's much harder for people to alter their plans once they get here and its harder to get your message out. Once people get to the Gold Coast many often already know how they're spending their time so it's a tougher ask getting them to change their plans. It's also made more difficult because when you go to the brochure stand at the hotel Top Golf becomes just another thing to do in a sea of things to do. Now obviously this doesn't mean no one is flexible with their plans or it's not worth advertising on the Coast, but the point is that it's worth marketing at all points along the way, from day dreaming about places to visit to planning to 'what shall I do tonight?'. Top Golf absolutely should get it's own unique advertising everywhere, leave it to Gold Coast tourism to include Top Golf in compilations of the whole destination.