Well, usually (?) it means turning a piece of music (audio) into written sheet music/a score. It means that in jazz and...I believe many kinds of contemporary music. (In classical music I've heard it applied to e.g. turning an orchestral score into a piano score, i.e. an arrangement.) Here they appear to just make MIDI files, avoiding the problem of how to write the notes most readably, which is a significant part of transcription, in both these senses.
All the examples given here, though, appear to be of a super-simple variety, with dead-simple chords, all notes with robotic, mathematically-simple timing over fixed tempos produced apparently by drum machines - like toy music, the kind of music that's no challenge at all to transcribe, and in the real world I wouldn't bother transcribing by hand as there's nothing to be learnt by doing so, as you can hear exactly what's going on without it. So, that's weird.
All the examples given here, though, appear to be of a super-simple variety, with dead-simple chords, all notes with robotic, mathematically-simple timing over fixed tempos produced apparently by drum machines - like toy music, the kind of music that's no challenge at all to transcribe, and in the real world I wouldn't bother transcribing by hand as there's nothing to be learnt by doing so, as you can hear exactly what's going on without it. So, that's weird.