Yeah, this video doesn't really cut to the chase at all. I guess it's trying to answer the question as to whether linking to a 301 necessarily results in more lost value than a direct link. And the answer to that is no (which I assume is widely known).
That said, IMO there are reasons why value may not flow through a 301 while it might flow through a link, and this question isn't addressed at all.
If the advice is that leaving 301s within your internal links is all fine and dandy, I would have to disagree. 301 external URLs only.