Yes the link to IAD isn't in Phase 1. Maybe he is thinking of the 5A bus(mentioned Rosslyn).

I don't understand why so many people take the 5A bus over the Washington Flyer Bus. Yes the 5A bus is 4 dollars cheaper but pretty much the whole day(except for late at night or maybe even early in the day), the bus is completely cramped. Give me the more reliable, comfortable( WFB has a lot more space, nice seats etc) bus anyday of the week.