Another email from BIlly Hau, w an expert view:

I would say in fire prone area, they should be cut because fire will allow the species to spread. If there is no fire, they will not be able to reproduce as their seeds will be trapped in the seed capsule and cannot germinate. This species needs fire to reproduce even in it’s native range i.e. Australia. Those in TPK is probably ok. The strategy may be to thin out some of them mature trees and at the same time plant some native tree seedlings behind them. This improvement process will take a long time but we need some patients to due with forest.