Is that the entire Big Pineapple site, though, including the pineapple farm?
I see they share an address and found this note: Wildlife HQ is located within the grounds of the Big Pineapple, at 76 Nambour Connection Road in Woombye, so yes the zoo does not occupy the entirety of that 41ha.
Having visited in person, @WhistlingKite24 could surely provide an estimate in comparison to the other zoos he’s visited.