Sorry, but the answer in the video didn't address the question.
For those who haven't seen the video, Abhijat says, in sumary, "You're still a member of administrators, and you still have an admin token and it's discarded so it's safe". There's nothing about how you're supposed to successfully elevate.
If I am supporting someone remotely, and this is the first time I'm helping them, using my personal admin account, how can I possibly satisfy a Windows Hello challenge? The user is signed in as a standard user, I've connected via Remote Help or maybe another remote access program (seriously, you've blocked mention of a rival app!???). I want to uninstall a program which requires that I elevate.
When I do that, based on what I read above, I'm prompted for Windows Hello. I've never seen that device. I don't have a Hello PIN. I'm 2500km away so getting my face on their camera is *quite* difficult, and my arms just aren't long enough to enroll and verify a fingerprint.
You can't possibly be thinking that every admin will be enrolled in Hello on every device, nor that every user will be a local admin, so ... what are we missing here?