This video raises some interesting theories, but unfortunately it doesn't have any data to back up the more controversial ones. I'm inclined to agree with it, but I'd rather see actual evidence to back that up, if it's possible for that kind of evidence to be collected. Did the Greens' strategy during the campaign and during the last term of Parliament lose them a significant amount of votes? It's hard to say.
The summary being that the Greens were always going to lose seats as soon as the LNP slipped backward into 3rd place and got eliminated, giving votes to Labor, and that nothing the Greens could have done or not done would have changed that, is the most important piece of it, though.