On the sale of any type of property, part of the conveyancing process is the adjustment of the sale price. The purchasers conveyancer enquires as to what debts are outstanding and what bills have been paid ( ie rates). On settlement the sellers conveyancer makes out checks ( or transfers funds) directly to any debtors. In the case of strata, the buyers conveysncer will ask the strata whether there is anything owing, or prepaid in the levies.
I doubt that the seller would dispute debts even over the statutory period, as this will just hold up the sale, and could trigger penalty payments to the buyer.