Tyagarah is at 90 degrees to the coast, this strip runs parallel to the beach. I don't know the history of Tyagarah but Ian McPhee (glider specialist) has pretty much lived there forever and would know for sure.
As i mentioned, it was only hangar talk when we were talking about it one day after flying back from Evans Head with a group on a club fly-away day and spotted it. It is actually longer than it looks and i don't know how much has overgrown in the past 20-30 years.