This is actually a pretty confusing question. I had read this several months ago, then when I was at the 2013 Shot Show I noticed Lapua's new reloading manual also listed the 7mm Rem Mag loads to be using a Lupua case. They also reference that on their website. I talked to the Fins at the booth about it a little, and wrote a recent blog post that sums up the conspiracy up to this point.
Check out the full article here: http://precisionrifleblog.com/2013/05/31/lapua-brass-for-7mm-rem-mag/