Ann: Shareholder Support and Instructions, page-214

That is an "intention to amend" and also refers to Foreign Corporation's and not Individuals.

Personally, I would highly recommend including your Aus TFN. No harm can be done by providing it, but you may pay considerable Tax on selling if you don't.

All my research tells me that a TFN is the Aus equivalent to a TIN, and should be provided for all international transactions. It's no different to supplying your TFN to your ETF holdings that trade in foreign countries - you must provide it.

GLTAH