first you have to understand what carry trade means
Gold is high now, right, but have you read at least few articles why is it so high?
after you have done the previous 2 you will be able to understand that:
AUD/JPY is a carry trade influenced pair. Gold has something to do with aud, BUT in this case people trade it because of the interest rate differential.
Therefore, AUD7JPY movements are more much like GBP/JPY and USD/JPY.
Ofc what you said it right ( partially) the australian economy ( and AUD) are strongly based on gold price ( because they are the larger supplier of gold around), BUT JPY pair are not based “strongly” on fundamentals they rather respond to FEAR ( interest rate differential investments are considered risky)
that is also why they are so volatile.
If you immagine it from a trader’s perspective, if you fear that you will loose your money you will rather sell something that has a high risk ( all JPY pairs) and keep the safer one (GOLD).
hope it helps.
GL M8