Its purpose is to sort messed-up interwiki links. For instance, some links in belar hockey that I have delete and fixed had been linking to the article for not field hockey but for general hockey including ice hockey, 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.