As a non-native english speaker: He absolutely rushes through his explanation at break-neck pace, and he rarely changes the tone of his voice from a droning monotone. For me that makes it incredibly difficult to process and retain anything he talks about.

As a native speaker he was speaking at a fairly normal pace, and his intonation was fine, just more subtle. Voices like his are not uncommon, especially in engineering. That being said, based on his accent it is possible that english is not be his first language.