This guy probably got laid off and is trying to "get back" at the company. Negative tests do not include battery life tests. They are app-specific, usually include loading speed tests, etc.

Literally every big tech company on the planet does these to quantify the value of say, reducing latency to load a web page or image. When you see the revenue drop from a web page taking 1 second longer to load, you know whether it's worth investing engineering time in.