Its purpose is to sort messed-up interwiki links. For instance, the links from East Asia that I have deleted had been linking to articles for not East Asia but for Far East, hence obstructing further automatic interwiki updates to take place.
The task cannot be done automatically, so I manually choose what do delete and what to keep. This is not a automatic bot, but rather an assistant of manual jobs. Its behavior could be arbitrary.
Since it's all guided, the edit rate will be very slow - it should edit no more than around 5 articles per hour.