Does Apple iPad Air 4th generation support Face ID

iPad Air uses Touch ID from the side button, no Face ID.

No. iPad Air4 does not support FaceID.

iPad models that support FaceID have a TrueDepth sensor/camera array - which is not present in any model of iPad that features TouchID.

The TrueDepth sensor incorporates several elements - including an infra-red (IR) dot projector and IR camera.

Absolutely NOT.

The 2020 iPad Air 4 ONLY supports Touch ID via its main power button.

The 2020 iPad Air 4 lacks the needed Face ID camera technology.

Sorry.