That's super cool, but no I wouldn't say it's more impressive or groundbreaking than AlphaGo. They're both obviously incredibly impressive though.
I guess I don't get the point you're trying to make. Why does something have to be practical to be impressive? And why don't you think the technology used in AlphaGo is practical?
So in one sense, those machines are unupgradable; you can't upgrade them without violating a number of laws and regulations.
In another sense, they're trivially upgradable; if you don't care about violating laws and regulations, you've got a playground with a number of highly documented vulnerabilities and publicized exploits.
The sorts of people who would install malware on those computers are the sorts of people who aren't really fussed about "laws and regulations"; that's not a position that people running a hospital are really able to take, though.