I'm guessing he's training both. As Metamoris 3 gets closer I'm sure he'll focus more and more without the gi on. Royler has never had a big online presence or lots of training/rolling footage out there so it's mostly guess work. The guy won 3 ADCCs back to back without a point scored on him, was one of the first of the old-school BJJers to go heavy on the foot locks, and he was the first to write a no-gi instructional book on submission wrestling. A lot of the shit in that book isn't basic either.
Royler is more no-gi friendly than a lot of people assume.