I have no idea if that's the case in this specific instance, but it would explain why they think it's "flawless" when, to a native speaker, it's everything but.

But sure, they can get there with the right expertise and some more time.

Once there, they will start to face the uncanny valley of other cultural differences: e.g. a Japanese person/actor behaves/acts in a way that is different from the way a westerner behaves/acts. That will really be "peak" uncanny valley. Even just the Forest Gump clip in Japanese gave me all kinds of weird feelings for its incongruity - and I am not even a Japanese native.