Qantas have a delay and cancellation policy that sets out reimbursement for hotels - but - it only applies for situations within their control. Not for situations outside their control which are defined in a footnote
“Delays or cancellation outside our control include: weather events, air traffic control issues, industrial action by a third party, security issues or any other unusual or unforeseen circumstances which we cannot control and the consequences of which we could not have avoided.”
Compensation and Refunds Policy | Qantas
www.qantas.com