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The program is comparing the AirTerminal:SingleDuct:UserDefined Primary Air Outlet Node Name to the ZoneHVAC:AirDistributionUnit Air Distribution Unit Outlet Node Name BEFORE the air distribution unit node names are read in. So the UserDefined component reports the error. The program does find the correct node name after the warning is issued so it looks like this is a false warning. It's no surprise the program did not stop executing so I suspect someone has seen this warning before (i.e., the line of code ErrorsFound = true is commented out). I think you can safely disregard this warning.

ZoneHVAC:AirDistributionUnit,
    TunnelTerminal,          !- Name
    TunnelInlet,             !- Air Distribution Unit Outlet Node Name
    AirTerminal:SingleDuct:UserDefined,  !- Air Terminal Object Type
    AirMixer;                !- Air Terminal Name

AirTerminal:SingleDuct:UserDefined,
    AirMixer,                !- Name
    AirMixingEMS,            !- Overall Model Simulation Program Calling Manager Name
    ,                        !- Model Setup and Sizing Program Calling Manager Name
    DSAHOutletNode,          !- Primary Air Inlet Node Name
    TunnelInlet,             !- Primary Air Outlet Node Name