It's pretty simple really, they have 90,000 "believers" who have already signed on (basically a statement of support, a non-monetary membership).
Survey them online and they'll tell you what name they want.
I suspect it won't matter to much, "Tassie" will be used by most people.
Also, the Big Bash is hardly a great model. It's now in the toilet because, among other things, they went too far away from tradition. You have to strike a balance. People care about "Tasmania" and "Victoria" and it turns out they don't really give a s**t about the Renegades or Stars. Surprise surprise.
The Big Bash has struggled in recent years, but not because of the marketing of the teams. That has been an unqualified success, with the crowds over the decade of the competition dwarfing the state crowds of the 50-over format and Sheffield Shield.
I'm sure if you surveyed Tasmania's Basketball fans and asked them two years ago to name the new team, most of them would have said "Devils," After all, that was the name of the previous NBL team that existed there in the early 90's. What's the point of having a marketing team if you don't do your job and just name the team based on a "survey"? They thought beyond the square, came up with a new, catchy mascot (JackJumpers) and the rest is history.
It would have been a mistake to call the NBL team the Devils even though it would have been what most fans thought they wanted. Devils is boring, predictable and frankly the antithesis of what a modern, 2020's club should adopt. It shows literally no imagination.