I was going to post a similar comment, and then decided against it. I realized I haven't used Windows as a daily driver in decades and thought maybe there was a new use for it that I was not familiar. Glad to see I wasn't the only one confused by it. Closest I could come was they were going to lock out the user, but that was Windows-L or something wasn't it?

Meta+L is the lock hotkey on all major operating systems!