This is cute, but as others have pointed out it, it isn't really a correct implementation of a hash table. Also, it wouldn't pass a code review anywhere I've ever worked.
Well that's the whole point, right? This is clearly written for fun, it's not production code, it's not supposed to pass a code review. It's just supposed to be cool and interesting, and a challenge for the author.
[0] - http://lelandbatey.com/posts/2014/09/binary-tree-printer/
As much as others understand that it's not like this is some obsfuscated thing with some bizarro code that eats newlines for breakfast.
Merely avoids 4-5 newlines anybody can easily add, only affecting 1 or 2 statements each. With newlines expanded it would still as small as it is.