Does the iOS 14 camera update work on iPhone X?

On the camera front, iOS 14.4 will allow your iPhone to recognize smaller QR codes than before, and it also enables new warnings for cases where Apple can't recognize the camera on an iPhone 12 as a first-party camera from Apple, which would presumably only come into play if you needed to have the phone altered or repaired. One of the bug fixes also promises to eliminate image artifacts in HDR photos taken with the iPhone 12 Pro.

Any device that can run iOS 14.4.

No.

That article is old.

There is no new camera app. Just new features in the software.

It can't run on your X.