This video shows Touch ID being used with a laptop, not Face ID.
The interface is generic, so it should use Face ID on devices that have Face ID hardware, and Touch ID on devices that have Touch ID hardware.
FaceID requires special cameras and infrared lighting system. Perhaps they would add that to the mbp one day but that would be a crazy leak if they showed off that capability now.
Seems they missed a step here with rolling it out, or are withholding the obvious. I'm assuming the latter.