Meta PT is currently far from as good as Meta advertises it.
Some updates have already improved it significantly since launch, but you can still clearly tell that you're looking at a camera image. Technically, this is not achievable any differently with the cameras currently built into the device. The PT you see in YouTube videos is a compressed file, which always looks better than the actual image in the HMD itself. YouTubers who don't openly address this have been causing a lot of confusion among first time consumers since the launch.