Yeah, this is the map that was mentioned: the Chinese authors are crazy, but talented! :) The minimap images on both levels are simply lovely! But, most likely, as with other Chinese maps, it is very difficult to complete. The fact that it was translated into English is good (although, it seems like there is very little text there).
The original version is located here (author - Season). You can also read and discuss it there.
I am currently engrossed in a long (apparently) playthrough of another difficult map. Masters, who will take on completing this "Way Home"?

Addition. I wanted to find the source of the English version. For now, I found this: a story about the playthrough and its discussion on the well-known English-language resource celestialheavens.com. Elv1sisalive, if you are fluent in English, you can check it out.
By the way, here is what they write there:

Some foreign H3 players say that it is very hardest to walkthrough a Chinese map.
So I try to teach you how to get it through :)
Chinese map edited by our players are often harder than official maps, therefore we call them BT map (BT is short for Chinese words "biantai", means is hardest than normal).