Though they very obviously draw inspiration from the main map from D2, this is in no way a plagiarism - more of a tribute. It's a broadly similar setting that's entirely different in its details, as even the most cursory side-by-side comparison would quickly reveal. And at any rate, you get to fill it out however you want - it needn't end up having anything to do with the Kuo-Toa if you don't want it to.
Rating: [4 of 5 Stars!]