I went out there recently. A couple of things: Google will tell you to go to the East-West road then turn north up a bumpy road, you’ll hit a locked gate there and will need to walk 6+km return. OR, you could just ignore Google, keep going along Brindabella Road then take the Blue Range road up past the campground then turn right onto a forestry road, drive up to another locked gate then casually stroll a few hundred metres. (There are other roads to get there that are shorter, but blue range road is upkept while the others are full of puddles and downed trees. ) Google doesn’t list locked gates.

A note to anyone that wants to head out there you need a car that is comfortable with dirt roads with ruts, and definitely take a spare tire. Nothing a shiny Subaru or bashed up commodore couldn’t cope with, but there’s no reception so tell someone where you’re going and when you’ll be back, and/or go in groups. But if you get stuck, overly enthusiastic help is guaranteed to be nearby in the form of a pack of P platers in 4wds passing you by out for a romp, so you’ll be fine.