He's got a good, non-emotional speaking voice, and his content:noise ratio is high. Also, the tempo of the overview is near perfect, and his choice of what video to show to go with his voiceover is flawless.
He reports the facts in a way that doesn't give any clues to any biases; he gets neither excited nor upset at any point that I could detect. His voice is pleasing; not nasal, screechy, grating, nor anything else widely considered objectionable.
I suspect you knew all of this and were simply trying to jump on some point that sounded subjective to you and perhaps it is, but that's what I mean.
Can you please elaborate on what you mean by this?
What makes it good? What makes it non-emotional? What is an example of a bad voice? What is an example of an emotional voice?