I wonder if you misunderstood him. I've never heard of any of the modern archtop luthiers using rosewood for any body parts (of course it's long been used for fingerboards and bridges). Maybe he was talking about flattops (as Zizala suggested). If he was actually talking about archtops, that would be pretty unusual. The great Jimmy D'Aquisto (legendary apprentice of John D'Angelico) once stated that rosewood "does not belong anywhere on a guitar"...
No, he's not using rosewood today, but was using it years ago. Maybe he made a mistake and ment something else.