I disagree. It is the best insight we have as to their level of balance. If they are imbalanced, they level of critical analysis means they need to work a lot harder to hide it.
How could you possibly know this!?
In my view the ABC is close to a constant, so the question would be more aptly phrased, "are the ALP right of the ABC". Re many issues I agree the answer is probably yes. The ALP and LNP are so similar on many issues that the middle ground is probably to the left of both; and therefore so should the ABC be.