Do those figures include the pre order sales, or are those over and above the 400 k?
(Edit, it says brick and mortar retail. I suppose that could include some pre orders as my local shop had a pre order option. However it makes no reference to any digital buying a.k.a steam, I wonder just how many copies have been sold.
I don't know, but I would come to the same conclusion as you did. And yeah, Steam/digital sales are missing at the moment so we can only speculate right now. If it follows current trends though, digital sales should closely match or exceed physical sales.