As an Aussie, absolutely heard about this and was frankly disgusted not only by the comment, but the timing given he had said it some 2-3 hours after it happened.
At that stage, information is still coming to light and proper investigative processes have to be undertaken. I don't believe the shooter's names were even released in full at that point in time.
I maintain that the best thing Australians and the world at large should be doing is coming together and collectively rejecting everything those shooters stood for. Being divided is exactly what they wanted, and unfortunately we Aussies are seeing that in politicians and fellow Australians.
Some incredibly heroic acts of bravery happened that day transcending racial and religious barriers, and we should be remembering and commemorating those people and their actions.
I reject any comments from politicians using this tragedy for brownie points. Due process will continue, the scumbag will surely have the book thrown at him, and we can make an informed decision on what's the next best move to help prevent further tragedies like this from happening.