Bike parking is not affected. The reason for reduced parking is that they need some place to put their equipment and construction materials, and that would be surface parking. Parking garages remain open, but EFC doesn’t have any. From the “No parking” link above:
“Beginning Sunday, March 15, surface parking lots at East Falls Church, West Falls Church, and Vienna stations will be closed for seven to nine months, as construction contractors begin the process of moving material and machines into place. Once these lots close, there will be no parking available at East Falls Church, severely limited parking at West Falls Church, and reduced parking at Vienna Station. Parking at Dunn Loring station is not impacted.”