Honestly this is the only version of these kinds of devices I’ve ever seen that looks like it would actually work, and it isolates the contact surfaces inside the body so that it actually does keep anything from cross contaminating.
I have a medical device I helped design in my house that uses magnets entirely instead of Fasteners to hold it together and I came up with a similar use of friction fitting magnets into metal, however, I worked out a way to do that with annodized material as well- which would normally not allow such things because it would be too much pressure and shatter the magnet.
I can already think of a better version of this thing that has a stylus tip integrated but I have no idea what the ramifications of copying a design of something like this would be and making my own and selling it.
Pretty sure that could end up in a lawsuit. Which is sad, because I would beef up this design. I really like it.