If you were making laws from scratch now, it would likely make sense to define categories strictly by ABV, not by brewing/distillation method.
That's probably solvable-ish by fining companies found to have an ABV off by more than 1% or so, but that's a lot more work to monitor, especially with the number of different products on the market.
The accuracy requirements are very strict on this. It's already not a problem; intentionally lying about ABV on the label would be a foolish thing to do that would get you in lots of trouble.
If improperly ABV-labeled alcohol is detected, it will be immediately recalled from all shelves nationwide, no court involvement necessary.