CUB use a variety of hop extracts that also impart hop flavour and aroma. Iso hop is an "extract of an extract" and is bittering only for IBU adjustment. It's a common misconception that this is all they use in their beers.
Originally they built their hop extract facility to smooth out the seasonal variations between hop crops in those days, not because they didn't want to use "normal" hops.
I have it on good authority that they do use a very small quantity of hops, probably Superpride, in the boil to create nucleation points for the hot break.
A good example of their differing extracts is to go to a NSW pub that serves Reschs Draught and try a glass vs VB.
An even better one is to compare VB with Melbourne Bitter, both of which come from the same mash and boil before being watered down* then "dressed" with caramels and hop extracts for retail sale. MB actually has a nice hop background for an Aussie.
* Ooops did I say watered down? What I should have said was "the gravity adjusted to sales strength"
Should also have mentioned that CUB / Fosters do indeed use hops in brews such as Cascade Premium. It used to be Hersbrucker but now it's Summer.
edit: nearly all the cheap Euro imports by liquor chains, for example Oettinger, Henninger, Hooten, Sainte Etienne, use hop extract, demonstrating that you can get nice euro aroma and flavour from extract.
Hop extract is a bit of a mythbuster thing for me which is why I tend to bang on about it
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