It is very relevant. Your question was whether Ravio got the items from his worlds dungeons. First we must determine whether Ravio would be likely to do that. Also determining if his status in Lorule is synonymous with Links in hyrule as a should be hero shows if he would be entering dungeons...
That sounds cool. I don't think that Ravio is quite brave enough to brave his realm's dungeons. Perhaps they were items from the Royal Treasury he stole, or maybe he invented them.