Too resistive, or at least, higher than what they were aiming for. You can compensate by making traces wider to get a lower resistance from the same resistivit

Too resistive, or at least, higher than what they were aiming for. You can compensate by making traces wider to get a lower resistance from the same resistivity, or by running circuits slower (digital circuit speed is often limited by the RC time constant where C is parasitic capacitance of an input somewhere — a higher-resistance trace takes longer to charge up the input gate capacitance). How hard it is to adjust for the higher resistivity will depend on the circuit, of course.