As he points out the current ranking systems are based largely on research quality which is not necessarily related to the quality of teaching. He says a 2013 study provides some data (this appears to be "Factors Associated with Job Satisfaction Amongst Australian University Academics and Future Workforce Implications" by Peter Bentley, Hamish Coates, Ian Dobson, Leo Goedegebuure and Lynn Meek).
One interesting variation in rankings is the Ranking Web of Universities (Webometrics Ranking), which bases it assessment on the university's web presence. This produces a result similar to other measures but is easier to compile. Perhaps that could be applied to provide a measure of teaching quality, not just for Australian institutions, but world wide.
This, of course assumes that students are interested in teaching quality. It may be that students select a university based on its research reputation, as that is how the quality of their qualification will be seen.