This idea was first floated years ago.
AFAIK, it was first tried before the LN bearing and IMS bearing removal process was offered. But there were "concerns" that led to the approach that LN/Flat6 took in offering a ceramic bearing.
Then about a year ago, a poster on one of the forums tried it but he has since gone silent.
As for the one recently offered, all I can find out is that it is fairly recent and they have installed a few but how many, exactly how long ago and under what conditions they have been tested is not public that I've seen.
I'd be interested in the relative success of adding DOI to an existing bearing versus using a new bearing but that takes hundreds of samples before you have any real basis for a judgement and this hasn't been in enough cars yet to let us know much about their success in solving the "concerns".