yeah that's the hong kong version of trickster, the only version of the game that makes eTO look perfect. The unicorns were the "original" guardians used in the pre-release press photos. Till kTO released guardians that looked nothing like them they were thought to be actual guardians. hkTO (cTO as you call it) never got the memo that those guardians aren't in game, and just cut and pasted them in from the press photos.
as weiss said they might have been abandoned, they might might show up in the future in myshop, it's unknown right now. There's a rumor floating around that a kTO GM said they'll be coming soon, but it's one of those "friend of a friend" things. There's also been supposed animations of them, but they seem to be fakes, mostly as the small form of the black unicorn looks like a mix of pet parts.