Basshunter (the artist) is famously geeky, another of his song's is "Vi sitter i Ventrilo och spelar DotA" ("We're sitting in Ventrilo, playing DotA". If I remember correctly he performed at some gaming/esports event like DreamHack a few years ago, too.
Here's a video with english subs: https://www.youtube.com/watch?v=E7iU0GGVco8
EDIT: oh yeah at the end <SPOILER ALERT> it does turn out that she's really a human girl. </SPOILER ALERT>