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That needs to be cited by a source. Wuxia movies and Historical period movies/series in China in general tend to be infamous for INaccurate costumes and improvisations, etc. Not to say all of this or even any of the costumes in here are inaccurate - but to make such a claim without any backing leads to historical misunderstandings.
At least some of the costumes seem to be Tang style though, on a surface level at least.