I didn't bother to look at the video and went looking for articles that covered this instead, so here's what I found online that partially explains what you want to know.
Introducing Adminless Windows 11: A New Era of Security for PCs | Windows Forum
That article also refers to another by another author at the following, which I found more informative, but I'll leave it to you to decide which is easier for you to understand. It also refers to the original Microsoft Insider Blog article that included the feature, but there's little mentioned there, so I'm not bothering to include that reference here.
Adminless Windows 11 is Coming; Here's What It Means for Security on PCs | Beebom
The following excerpt from the second article describes how the operation of gaining Admin access to do things will work, as compared to how it does now via UAC.
"So instead of allowing UAC prompts, users will have to enter a PIN or authenticate using other Windows Hello methods to temporarily grant admin rights, similar to macOS and Linux. "
The bold text I added above indicates that you'll use either your PIN or other Windows Hello methods, which means items like Fingerprint, Photo, etc., so those will of course be available.
The primary reason they're using Windows Pro Group Policy for this new feature for now is apparently so it's just not turned on by default in the most recent Insider builds where it's being tested. Once Microsoft decides whether and how to release this to the wider Windows population, they'll include it in some future Windows 11 major update and since its purpose is to help consumers, it'll obviously be included in Windows Home whenever that time comes and need to be turned on by default in order to replace UAC completely.
The articles both mentioned that Microsoft will be discussing this new feature at Microsoft Ignite in November, so there'll likely be some additional information about the probable release date and other details made available at that time.
Rob