All the major contributors to the field agree that it's only accurate on a continental level at the moment.
I do believe it will improve with time.
Here's Roberta Estes' take on it.
https://dna-explained.com/2018/12/28...te-yes-really/
Here's another article quoting Debbie Kennett and Adam Rutherford
https://eu.freep.com/story/life/2018...cy/1517018002/