Reviewers often categorize this as a "filler" episode that is saved by its ending and technical merits.
Thea discovers Oliver’s secret child, William, but surprisingly supports Oliver’s decision to keep it from Felicity. [S4E14] Code of Silence
[S04E14] - 'Code of Silence' - Post-Episode Discussion : r/arrow Reviewers often categorize this as a "filler" episode