Meant to add:- No doubt the ASX guidelines state a delist can be...

Meant to add:-
No doubt the ASX guidelines state a delist can be approved on an ordinary resolution, however reading the guidelines, they do have the capacity to impose other conditions they see fit, so it certainly "shouldn't" be out of the question for them to impose more stringent voting requirements.
I think because they had issued preliminary approval on an ordinary resolution originally they felt obliged to stick with that ruling and would not reconsider.
They will now be well aware of minority holders position on these matters and may take a different view of the request this time around.
Important for holders to voice their concerns.