The example is .NET Core 2.1, but the actual library itself is .NET Standard 2.0.

It will depend on how the System.Console class is implemented in Linux and macOS. It might fair better to port the example to Mono or .NET Core 3.0 (which should just be a change of build settings).

  _______________
  |   |     |   |
  |   | STD |   |
  |   |_____|   |
  |      |      |
  |  FX  | CORE |
  |______|______|