That 90% of "ADSL" customer base appears to mean ADSL1 only, while most people are on ADSL2 where they can get it. They would have specified it had they meant ADSL2. That 90% is also helped by their recent forced "upgrade" of customers to unlimited plans.
A recent thread on the Whirlpool broadband forum is an interesting read :
http://forums.whirlpool.net.au/forum-replies.cfm?t=1604226
That announcement was mainly spin as far as I could tell