PP stated when this project got underway 'all those years ago', that the golf game was a side project from their main priority which is the golf simulator. The game would run from the same software that the simulator does, but they would have to develop a means of converting folks hitting golf balls at a screen to players sat at a PC using a mouse to hit the ball.
Perfect Golf the game was never going to be designed, coded and released in a matter of months. Heck, I would hazard a guess that for the most part, work on the game has sat idle whilst the simulator side of the project took centre stage. They have got to make their money somehow, the golf game part of the project won't fund itself. The Kickstarter failing didn't help and as there was no crowd-funding money coming in, they had to look elsewhere to raise the cash - so it was back to the simulator build and the game would have to wait.
This is the nature of the beast which is game design. Some folks can't hack it as they want a game and they want it now.