Send the owner a bill for the repairs wrongly paid by the owners corporation.
If (when) they refuse to pay, take them to the small claims court on the grounds that the strata manager knew the owners corporation was not liable for the payments but went ahead and allowed the work in any case.
You are not seeking penalties – just for people to pay what they owe due to an error
Meanwhile, report the strata manager to Fair Trading, just for the Hell of it (they won’t do anything because they never do … ever!)