So is undervolting also a form of overclocking?

So I followed an undervolting guide on my 4090. I set the voltage curve at 975mv to 2800mhz and then flattened the curve. I then set my memory to +1200 and power to max. My timespy score went up about 400 points. Not a big gain but apparently less wattage and runs cooler. I am new to this, is this a good result?