The test only shows if you are being slowed down when the test was run. Because a combination of the devices temperature, battery charge and the battery’s impedance (affected by health) triggers the throttling, it is unlikely anyone will be throttled all the time. Devices that are throttled will get fairly inconsistent scores with my tool precisely because the CPU speed is fairly inconsistent. If you want additional verification you can look up your battery's health. There are free apps on the app store which try to guess at your battery health which are probably accurate enough. Here is a good one to get you started.