answer will depend on why it seized. Crankshaft/rod seizure and you are basically done. Something interfering with the flywheel would be a lot easier to fix. Bearings on the edger shaft after the belt is removed would just require bearing replacement.
in your other thread he said it pulled fine yesterday... if it didn't lock up while running, remove the spark plug and try to pull it... could be hydrolocked with gasoline. possibly.