That guy should replace his MacBook battery, it’s getting swollen…
Not a Macbook (Windows key is a dead giveaway), looks like a Dell. And if that is the case, very high chance the battery is actually under the track-pad, and that curvature near the middle is just how it is shaped.
Looks like Lenovo to me. The key caps are pretty usual Lenovo stuff.
You might be right. I was getting Dell Latitude vibes from it: