What other explanation could there be?
The Canberra Times reports there will be 63m long blades on towers near Lake George. An increase of 6m from the current 57m.
The towers will be the same height at 94 metres according to the report attributing that statement to Mr Griffiths. However he also claims the overall height will be the same.
The radius of the circle they describe will be increased by 6m.
Unless there is some extraordinary manipulation of space dimensions so the tip of the rotating blades rotates into another dimension at the top arc, and returns to normal space on further rotation, the effective height of the whole tower plus rotating blade will also increase by 6m.