Could be. Found the report and BNE is the lowest at 52% but Hobart/Tasmania isnt calculated
When I lived in Tas Greater Hobart was less than 50%.
Tas - total 526,000 (back in late 90's population was sub 500k and dropping, me one of them leaving, but I only went there for uni)
Greater Hobart 226,000, 43%
Brisbane's number one issue is that the two coasts I believe are counted seperately, but really part of Greater Brisbane.
Qld - 5,265,043
BNE - 2,514,184
GC - 693,671 (includes Tweed)
SC - 341,069
So basically almost another million people within commuting distance of whats defined as BNE and part of the Brisbane commuter rail network.
But if we ignore state borders and look at BNE as a major centre, then even more to the south.
There is bugger population south of Hobart, very little to west and by little I mean less than use Doomben trains each day.
On north side after suburbia there is not much more until Launceston.
Hobart really is the accidential capital and only became so because of known water supplies of the day. It only exists as it does today because it is labelled the capital and as a result has the govt departments etc based there to provide some sort of a foundation yet most industry and commerce is in the north. Tas's capital should have been Launceston. Today L'ton's port is nothing (Hobart;s is only marginally better with Burnie being the main port for the state) but back then L'ton was significant, its centralised, easier to get to Victoria for shipping and flying and the weather is better.
I dare say had the capital been in the north from the start, Greater Hobart would be less than 50,000 people today and Greater L'ton would be 300k with more living in places like Deveonport. it would certainly help eliminate all the duplicaton of govt services (and private sector) between Nth and Sth that have plauged the state for decades including the ongoing $hit fight on which port should be the main one, instead of the 4 fighting over the scraps.
I suppose this will lead to the argument should Brisbane be the capital? Further north safe shipping options I think were limited as was water supplies and quality of soil back and the further north the less friendly the weather for the days of old and no AC. Today BNE is probably still ok as moving it to Rocky isn't going to change the status or distance for NQ/FNQ and the southern part of the state would more likely trade with NSW/Newcastle/Sydney. The Dirranbandi railway was a classic border railway fence to stop farmers exporting via Newcastle.