Really iPhone Face ID WAS NOT a fail if the iPhone.It is a fail of people who prepared presentation, so don't worry, sell your organs and buy it!!!
As you can see, further attempts to unlock the iPhone with the help of the already correct finger do not work in any case, until the user enters the password manually. That is, the display of this message is not connected in any way with the incorrect operation of Face ID in the case of the presentation of the iPhone 10.