i think the point the parent is making is that a better time to strike would be when they have specific demands that management is able to meet - to get them to the negotiating table, or to get them to sign a contract.
but in the case where management is already at the negotiating table, and there's no contract to be signed, it's not clear what short-term goal a strike is meant to achieve. the only thing it does is cause hurt. Hurting management is going to make their negotiations more difficult. and hurting management in this specific way is not just hurting management, it's also alienating their journalist colleagues who should be their strongest allies in this fight.