Of course it's a depth-from-mono model, it says so in the article. Apple's "true depth" is an estimate from two cameras, that's not actually real depth either

Of course it's a depth-from-mono model, it says so in the article. Apple's "true depth" is an estimate from two cameras, that's not actually real depth either but it's exposed to developers. Also in the article "We’re happy that this depth data — both the human matte and the newfangled machine-learned depth map — was exposed to us developers, though."