Yeah alright, I completely agree with what you're saying, and if there was a question about the effect of the TOT on the CAD that would certainly be useful in fleshing out a response. However, in terms of the VCE course, the end result is that a decrease in the TOT should, in the long term, place upwards pressure on the size of the current account deficit. Previous exams, both textbooks, and relevant bodies such as the VCTA and CPAP support that answer. Therefore, whilst in the short term there is the response as you describe, in the vast majority of cases that would not be enough to receive full marks, at least in my understanding, particularly as the J-curve isn't explicitly part of the course.
Taken straight from the economics down under 3/4 textbook:
Effects of the terms of trade on Australia’s CAD
When the terms of trade rise or fall (due to changes in our export prices relative to import prices), this will affect the values of both exports and imports and hence the size of Australia’s CAD.
A fall in the TOT tends to cause the CAD to rise. This is because when we receive lower prices, for example, it often means that there is a relatively weaker demand internationally for our exports. In turn, the value of credits for our exports usually decreases, while dearer global prices paid by us for imports tend to increase the value of import debits.
A rise in the TOT usually results in a decrease in the CAD due to higher prices causing a rise in the value of credits for exports relative to debits for imports