First off, opinions are like noses (keeping it G rated here), everyone has one, and they are all slightly different. So, get several opinions from people you can have ongoing conversations with (like here vs YouTube), and take each into account with everyone's reasoning. Then, make your own mind up with your reasons for doing so. After that, run the recipe by us on here so we can tell you what we think.
Second, I will STRONGLY recommend that you start out with someone's tried and true recipe that you can depend upon to turn out well. Once you get the hang of making soap and learning what to expect, then you can branch out and figure out what each change makes. Avoid recipes that involve expensive ingredients until you get the hang of it. (I would still avoid them then, but that is me, and I have tested most of them already.)
Third, don't believe everything you see on YouTube. There are people there that say untrue, and in one case, dangerous, things. Watch a LOT of YouTube videos by lots of different people. Research what you see and hear by reading SMF or other soap making forums. Read at least the first 5 pages of threads on the beginner forum. Follow that up by about as many pages on the lye based soap forum. Then you will have a good amount of solid knowledge that you can count on.
Finally, superfat (SF) determines the amount of fat/oils/fatty acids that are not reacted with the lye (NaOH+H2O). This does determine the amount of free fatty acids that can stay on your skin. If you live in an area with hard water, and do not have a softener, then a higher SF is not a good thing, as all that SF will become soap scum that will stay on your skin, walls, and inside your pipes. 2% SF is my new rule.
ETA: Just watched the video in question. She does promote safe practices, so I am not worried about that, but that recipe is going to take about 6-9 months to cure because of the high olive oil amount. I am assuming that you would probably prefer to be able to test and use your soap more in the 4-6 weeks time frame. I would also never put the soap on a metal rack. That is just asking for DOS. Also, do not store it in a cupboard or drawers. Even with a Damp Rid.