I get the joke, but also I was shocked to see in the article:
Thunderbird for Android runs on mobile devices running Android 5 and above.
Who out there is still running Lollipop?! That came out over a decade ago. You can’t even get Thunderbird through the Play Store because Google Play Services dropped support for 5.1 back in July. I have so many questions.
This is an ego fluffer app, not a scientific study. The accuracy is “good enough” to give you a rough idea of your performance, and if youre really into optimizing WPM, give you a way to track progress or the impacts of using different keyboards.
Getting a high score doesn’t actually mean anything except you probably use your phone too much.