It's a cool idea and I'm pretty sure it will be more common in the future, but right now almost nobody uses it for a couple of reasons:
1- You actually need a CAT scan of the tooth you want to replace beforehand..sometimes it's not possible (i.e. people who lost their teeth years ago, and now want to replace them)
2- Costs are probably significantly higher for everyone
3- Normal implants are more versatile, as they are basically hollow screws where you can mount a second screw shaped however you want (a tooth abutment, an attachment, etc) so they are also used to stabilize dentures, to create full mouth reconstructions such as all-on-four etc..this is not possible with these zirconia implants
From my not-a-dentist :) perspective, the concept sounds workable.
eg creation of the 3D model from scans, using a CNC machine to create the object from Zirconium, etc.
But I've no idea what other parts would need evaluating to make real sense of it. :)