This is a rather liberal reinterpretation because the original assets are unusable (text as graphics with baked-in highlights) and the highlight graphics used by GDX are too ugly for serious consideration.
As a result this highlights the font like the first Witchaven, i.e. coloring it green.
This isn't particularly faithful, though, neither with DOS nor GDX because both menus have UX issues.
Main menu items reflect what a modern engine needs, not what DOS had.
The hi-res menu background is not being used because it forces the entire menu into the upper left corner.
The original game had the difficulty only as a setting on the "gore" page and could not start the game from there. This has been changed to a more traditional skill menu.
The only other part that has been ported over is the help screens.