Discussions about Winboard/Xboard. News about engines or programs to use with these GUIs (e.g. tournament managers or adapters) belong in this sub forum.
NNUE is an evaluation method used by some chess engines. WinBoard is not a chess engine, but a user interface through which you can play against a chess engine. It can be used with any chss engine that complies with the WB or (via Polyglot) UCI standard. It doesn't matter whether the engine uses NNUE or other methods to pick its moves.