But I guess they are obliged to supply you with what you ordered, or face the consequences. I can't see that they would be obliged to provide you with something that you DIDN'T order?
That might be the case if the reason for Tesla not being able to supply the ordered car was because of an unforeseen circumstance or event. The critical point here is that Tesla knew exactly what it was going to do before the order was placed and accepted. This point changes everything.
If I was the ACCC, I'd be penalizing Tesla for unconscionable conduct and make them compensate all affected customers by paying them for the inconvenience of not having a car delivered to them for 12 months longer than the customer expected.