Yes and yes. If the RBA is buying $A, there's more demand for the $A, and vice versa.
Just think of direct intervention as the RBA actually going down to the marketplace and shouting at the dealer that they want to buy or sell some $A. Indirect intervention is the RBA saying "change the interest rate", then staying at home and watching TV for the rest of the day. By the way, remember interest rates are very, very rarely changed to influence the value of the $A.
I_F