Yes, TinyCore-Core comes without a GUI (like the commenter above said, headless). When they say 28 MB RAM, that might even be overestimating it a bit. All of TinyCore-Core fits into just 17 MB. Of course that goes up if you need to install things, and I don’t know if it comes with an ssh-Server out-of-the-box. So for a proper server setup, 28 MB sounds pretty reasonable.
It blows my mind, that there is an entire Linux Distro, that fits into a modern processor’s cache. Who needs RAM anyways? (unfortunately, because of how cache works, we can’t actually use it without RAM)






Well, if its unbreakable, then its either snake oil, or some variation on the one-time-pad (really depends on your definition of unbreakable).
But having read the article, this is definetly snake oil.