Hi and welcome!
Yes, the D1T would be a nonrev travelling zed from an int'l or domestic Japan location. This happens a lot too departing LHR with many nonrevs connecting in LHR from BA. You have to see an agent to get D1T status and show them your inbound boarding pass. The agent will then modify your status to D1T. If you don't get F, hope you are lucky enough to get J!