use common sense, why would a diagnostic machine like the examiner be replaced by a mat? what benefit would there be? the only way this magic mat can diagnose the car is by communicating with the ecu, which the examiner already does, so there would be no benefit, and yet there is the inconveniece of having to use a mat. obviously this would not happen unless the mat could diagnose in another way, and i greatly doubt the mat can scan the car with magic and then decide what the fault is.
as T14086 says self diagnosis has been around for years (about 15 years, since ecu's came along), but this diagnosis has always been based on communicating with the ecu. you dont need a mat to do that.