I too found the numbers a little... low.
I don't believe for a second I am in the top 5% of earners. Not when you have half the finance industry, doctors, lawyers, dentists, engineers, sportspeople, entertainers and many many many small business owners out there.
Would be useful to understand the inputs into how this was derived.... as we all know, tax return data is not meaningful when you've got people earning hundreds of thousands in super which does not form part of taxable income...