I'm not sure if the exact details, but based on what you're saying, that's a union busting technique. You strike for recognition of the union and to bring the company back to the table to negotiate the contract. If a company is raising wages in response to a strike that's generally an attempt by the company to show that they will "take care of you" without the union contract. Anything the company does to "help" in response to worker action other than adding it as a concession in the contract is an attempt to avoid having a concession in the contract.