He has either made a typo or he may have been referring to St George instead of Westpac. He has forgotten to mention Suncorp @ 5.57% but they price based on LVR so you must be below 80% to get that rate.
Yes it would be interesting to see what Westpac however I'm not holding my breath. They have been consistently more expensive than the other lenders for the past year. Hopefully they will start to change.