He doesn't mumble at all though, he speaks loud and clear, his voice is just monotone.
He probably writes notes down, but he absolutely did not look at them frequently like you said, he looked down and paused once the entire time.
I agree with you about him being quite emotionless and his monotone voice, but there was no mumbling or constantly looking down at notes or a lack of eye contact with Mike.
I was giving my impression of him based on several interviews I have seen.
I think he does mumble, yes I can understand him but he is hardly loud and clear for the duration of the interview (maybe it is easier for you, or should I say sounds more normal to you coming from Manchester yourself and hearing someone with a similar regional dialect to yourself)
This is not the first interview I have seen him look down at his notes in and a professional interviewer would either not need to do so or would do so in a fashion far less apparent.
I think he is a poor interviewer and he lacks an engaging personality which people in front of a camera generally require. Ok I understand he is merely the interviewer and the interviewee is the focus of the clip so they are the personalities that need to come across not his.
If however, you look at any professional sports interviewer and compare them to this guy I think you would probably agree he stands out as being an amateur, he always seems like any guy being given a set of questions to ask and filling in he doesn't seem like a professional sports interviewer to me.