YPJT, thats Moorabbin, YMMB, and has permanently displaced thresholds. Melbourne is YMML, and doesnt have displaced thresholds (at least it didnt when I was last there).
The displaced thresholds for Moorabbin are precisely because of obstacles that would otherwise infringe the splays. You're more than welcome to use the full length of the runway including before the threshold for takeoff, but landing must be made after the displaced threshold. ERSA RDS shows quite different figures for TORA and LDA.