Because of the way the series schedule is setup, they can – and should – be very liberal with their bullpen usage. The series is set to be played on Wednesday, Friday, Sunday, Monday, and Wednesday, so only one game will be played without an off day before it. Not only does this allow both teams to just use three starting pitchers, but it also gives the teams a chance to get a lot of innings from their bullpens without overworking individual relievers.
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Basically what they are saying is don't fight fire with fire. Philadelphia starters are better so counter that by going to the bullpen early and often. With all the scheduled days off, overuse of the 'pen should not be a problem.