The powers of the Fair Work Commission are different to the powers of the courts. The Commission is a tribunal and does not have the power to enforce the orders that it can make under the Fair Work Act 2009 (Cth) (the Fair Work Act).
The enforcement role is performed by either the Federal Court or the Federal Circuit Court. The powers of the courts (including powers to grant injunctions and make declarations) are not limited by any term of the Fair Work Act.