To argue about the jailbreak authenticity of the video makes no sense. Luca Todesco shows it running Cydia, and also shows the key features iOS 10.2 jailbreak - the error can not be.
Of course, this video is a guarantee of very long release iOS 10.2 jailbreak after its final release. The fact that Luca works at Apple - he is looking for "holes" for the further jailbreak establishment of appropriate jailbreak "Latok." Very bad news for fans of hack iPhone and iPad.