SN74LVC2G14: VOH & VOL when VCC = 3.3V

The specifications are measured at V_CC = 3.0 V to account for power supply tolerances. In other words, these values are what you get in the worst case for a 3.0 V ± 10 % supply.

If you actually can guarantee that your power supply is much more accurate than that, see [FAQ] What method is best used for estimating specification values between those given in the datasheet?