A piece of freight is to be moved by Polar, it has a Polar airbill and Polar will gain commercially from its transport - only they can't get the job done because their crews are on strike. Polar can try to ship this freight on a different carrier- say FedEx, but it's struck goods and stays that way so long as its carriage results in remuneration for Polar.
One problem with your scenario...
Since Polar provides "scheduled service," and their direct customers are primarily freight forwarders, it is likely there has been NO 'Polar freight' since day 1 or 2 of the strike. The customer -- the freight forwarder -- merely finds another carrier to carry the frieght that belongs to the customer (NOT to Polar). The freight is never consigned to Polar, so there is NO struck freight to be carried!
Even in the case where a forwarder charters a flight from Atlas to go from NRT, the freight (which MIGHT HAVE been consigned to Polar if they were flying) is never consigned to Polar, so AAWH can accurately state that there is 'no Polar freight' and 'no Polar flight.' You may not like it, but that would be the reality.