Lol that's great!
Wonder if they just ran across a supply of game boy screens and realized it would make sense to use them. This would not really affect the reliability of the actual medical device either if done right.
Funny thing is, if one of us tried to sell something like this as a piece of medical equipment we'd be laughed at and they would never certify such a thing but if you're a big enough company you can mostly do what you want.