The following is a quote from the latest patch notes:
The location of many of the Outland mineral nodes have been adjusted both to put them in locations that are more traveled and to make them more likely to be near creatures.
Since the current node database won't be accurate anymore, it seems to me it's best to delete the outland mineral nodes and start fresh. I have two questions about that though. Is that simply a matter of deleting the lines from Cartographer_Mining.lua? And won't (false) nodes be automaticly addes though node sharing from people that havent deleted their nodes?