I can confirm empirically that Future I-42 signs have been posted on the Goldsboro Bypass, if it matters.
That said, I also vote in favor of ditching usaif or at least treating it as deprecated (i.e. don't add new routes, remove or truncate existing ones as they become actual interstates or see the plans to make them one officially abandoned).
There is still one thing that needs correcting here, though: US70BypGol currently has two waypoints for the interchange at its eastern end (369 and 370), neither of which matches the coordinates of the US70BypGol_E waypoint or US70. To properly register the intersection of routes, US70BypGol should get those two waypoints combined into one (call it 369/370... or just 370) with the same coordinates as the corresponding US70 waypoint.