This seems to be an example of the “one true sequence” fallacy that I learned about from Isaac Asimov’s writings, and expanded upon by Calilasseia on this forum.
People look at the complexity of, say, an insulin molecule, and assue that nothing else would work . . . and that this insulin molecule is perfect. They make the assumption that this insulin molecue–in order to exist in its present form–must not have come from chance because it would be like getting 100 royal flushes in a row playing poker or something.
The problem with this argument is that there are any number of insulin molecules that would work just fine.
Diabetics have taken pork and beef insulin for decades, and they get along just fine, and pork and beef insulin are similar–but not identical–to human insulin.
In fact, I would wager (and offer favorable odds) that if we scoured the animal kingdom and assessed every form of insulin . . . that we might find a form of insulin from some animal that works even better than human insulin.
It is like this with almost every substance in the human body.
This is why this video is total bullshit.