Kaz, this doesn't mean the Botulism break out is still on going.
A multi billion dollar company such as Fonterra have the highest of QA. This was stopped, announced to the public and all possible batches recalled right there ASAP somewhere in the month of August 2013 and wasn't an issue further.
From memory, none made it to Australian shores anyway but the announcement had to be made either way as part of company procedure.
The notice of courtesy you received there simply states that temporarily, the WPC you received in your order is from Fonterra of New Zealand rather than the usual Fonterra of Australia.
Specs, percentages, nutrition and the Concentrate process of the Whey all remain the same.