@James79 said:
Their insurance does not cover the damage according to the strata manager (who also happens to be our strata manager).
All that means is that they don’t have cover – not that they are not liable.
If a claim against the car insurance doesn’t fly, or if the excess is excessive, you can always make a claim through a civil action. Whether or not they are insured is no concern of yours. And, by the way, this is not a strata issue.