That post is totally wrong, though. There's no way in which URLs with opaque IDs in are better for humans than URLs with stubs. If the stub happens to jog a users memory about the content of the post, it might be useful, and even if it doesn't sum up the post very well, it's still no worse than an opaque ID.
Try writing down "example.org/posts/1234" on a post-it note and then try writing down "example.org/posts/thing-with-a-long-name-with-lots-of-dashes". One is a lot more fun than the other.
