This app was mentioned in 1 comment, with an average of 1.00 upvote
Probably not the best because of the noise. So you need to remember to say important points - why not just hold a piece of paper you can refer to, or a tablet? They do it on the news.
You can also use a teleprompter app on a phone placed just below the camera lens. I have found it works best to stay looking at the screen - i.e. don't try to look at the lens at all. This can still end up sounding scripted and robotic but it may be useful for some situations. The free version of that app is fine, pro version just lets you save multiple scripts and reverse the text (for use with a real prompter screen)
Mixing in b-roll is a really good idea. We want to SEE what you're talking about. Ever had someone tell you a story and you have to try to imagine it all in your head? Wouldn't it be to use pictures to help? That's what b-roll does.
That video is over 7 minutes. I didn't watch it all so maybe I'm wrong, but I'm guessing there is a lot in there than could go. A series of 1-2 minute videos is more effective (i.e. "get to the point asshole!") than one long video. I have to deal with this all the time - my clients want to make a promotional video so they write a six page script, it takes all day to record, and ends up being a long boring video (the view stats prove it). They don't listen to my advice and still want to do things their way, but that's another issue entirely.
If the videos are short enough, then maybe you can get away with using less b-roll, just a thought.