Google came up with its own face unlock system for the Pixel 4 and 4 XL using those advanced sensors in the phone’s top bezel.

from https://www.theverge.com/2019/10/17/20919390/google-pixel-4-face-unlock-eyes-closed-privacy-eye-contact
https://cdn.vox-cdn.com/uploads/chorus_image/image/65492190/vpavic_191013_3731_0026.0.jpg