Launcher: The source netlist for "ADSU16.ngo" was not found; the current NGO file will be used and no new NGO description will be compiled. This probably means that the source netlist was moved or deleted.
All Xilinx Unified Library macros are treated as black boxes by the synthesis tools. The implementation models for these components is a NGO file. When Ngdbuild is run the NGO files are included to properly implement the design.
The message can be safely ignored.