They didn’t - last time. He got something like 19 first preference votes in his own right, and got into the senate on Hanson’s preferences.
He’s obviously made the calculation that in order to stand out from the crowd and make his own reputation separate to Hanson’s, a viable marketing angle is ‘I’m the guy who hates muslims even MORE than Hanson does!’ and say outrageous stuff to get his head on the news, in the hopes that it’ll score him just enough racist votes to stay in power. He only needs, what, 14% of queensland or something like that?
I wish I was more confident it was impossible.