From the ATSB report.
The captain cancelled the go-around decision by retarding the thrust levers. It is very
widely accepted that a decision to conduct a go-around should not be reversed. In this case, the cancellation action had a number of side-effects. It resulted in excess thrust after touchdown, a slight delay in spoiler deployment, cancellation of the auto-brakes (due to the number 1 thrust level being advanced for more than 3 seconds),