It’s in the ‘DAB+ Regional Planning Technical Report’ - accessible on the ACMA site here. The quote is from page 13 of that report.
Here’s a sheet outlining the auction results in the metro areas - the lots being passed in in Brisbane is a result of all the bidders reaching their 128kbps, and things like ARN getting their 64kbps in Sydney relatively cheaply once Triple M/2day reached their limits.
Annual Report for Digital Radio Joint Venture Companies - FY 2009-2010 - Attachment 8.pdf (116.9 KB)
(more of those annual reports - including one containing the spectrum auction rules, are on the ACCC website)