Not on IP so I don't know the answer but this thread
may answer your question(s).
After some more searching, it seems to be okay/on plan in small portions since it is higher in fat compared to other OP meats. Be sure to trim off ALL of the fat, read the ingredients in the brine if you are using it since some have sugar and other stuff. Also read some suggestions to make mock potatoes using cauliflower to go with the corned beef, just an idea.