You are wrong.
The 511hp was made at Perth Auto Salon using a hub dyno.
Autosalon figures should be taken with a large grain of salt, cuz in the end, their only purpose is to put on a show.
The 438hp was on a dyno dynamics dyno in shootout mode. Which is a fairer representation of the cars true power. Since Dyno Dynamics dynos are widely used when comparing HP figures.
The first thread said 511rwhp on stock injectors, people questioned the figure and wanted to know how it could be done on stock injectors.
It was then acknowledged by the workshop in question that 511rwhp was a BS figure and the cars true power was ~450hp, which has been shown on the recent dyno.
This whole debarcle is over a big HP figure being made on stock injectors, people questioning how it can be done on stock injectors and other people not telling how it was made.
I'm just here to enjoy the resulting show