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The action was taken by a cabinet member to order the Canadian Industrial Relations Board to step in. The CIRB isn’t controlled by any party. Singh came out with a statement that condemns the move, and says it signals that any federally-regulated field doesn’t have to negotiate with workers in good faith. I don’t know where you heard that any party has the ability to stop this other than the party who the current Minister of Labour belongs to, but no action was taken that needed to pass the House.
I get that you’re trying to say that the NDP was able to do something, but there’s no evidence they were consulted on it. Given that it lasted less than a day before the strike was stopped, it was probably something the government didn’t discuss long.