Wrong. He states the simple fact that union strikes cost Boeing billions of dollars and threaten it's ability to stay in business. That isn't "retaliation." That is stating the business reason for the move.
It's also retaliation. The law says that a business cannot end the jobs of union members in retaliation for any lawful union action, including a strike. As this relocation would end the jobs of union members and is being done in retaliation for the strike, it is unlawful.
When the company adds that the strike cost the company a lot of money, that's not adding anything pertinent. It's just whining. A strike is
supposed to cost the company money, otherwise there's no point to striking at all. In any case, a company can no more relocate so as to break a union than it can fire people for trying to form one.