NYTimes has dragged out the negotiations for months, refusing to have a contract. It's kinda a make or break time for the union.
When would be better to strike, what time would NYTimes and the audience prefer? It should be during a choke point otherwise management wouldn't listen.
Additionally, this is a high traffic time, but not really a high stakes time I'd argue. They're not going to influence the election by going out day before or day of it, they will just lose viewership to others covering what's happening.