On August 20, the following response was received from ESD:
As of July 27, 2015 Dean Street is an authorized truck route. The B3 truck protocols can be viewed by visiting www.esd.ny.gov/atlanticyards .
ESD Atlantic Yards Team
The full link for the July 27 B3 truck protocols is http://esd.ny.gov/subsidiaries_projects/AYP/AtlanticYards/AdditionalResources/TruckProtocols/07272015_B3_Truck_Protocol.pdf. The route being taken by the truck in the video is shown on page 6.