Physics Girl on PBS Digital Studios reported on an experiment using this technique.
NEW RESULTS! Cosmic Quantum Bell Test https://www.youtube.com/watch?v=i6WxIblKVZI
NEW RESULTS! Cosmic Quantum Bell Test https://www.youtube.com/watch?v=i6WxIblKVZI
And the experiment mentioned in your link confirms this non-locality up to the distances of 600 light years, but we want to confirm it for even larger distances and times, that's why there is a need for techniques like the subject of this discussion.