Xbox Exec confirms 1 million for Rise of the Tomb Raider = sold through to consumers.

[Baryonyx]

You can go ask Greenberg if the numbers was combined between the both last gen and next gen console. 
Microsoft have done the ''Combined numbers since launch PR trick'' so i don't consider the suggestion that it could be damage control at all, since the news actually comes from Mr.Greenberg and Microsoft. It's still 1 Mill sold=profits but a good amount of that numbers sure are on 360 as well. 
I am sure a lot of people who went Ps4 who owns a 360 bought it on 360 as well, at least the die hard tomb raider fans. 
It did good, but i don't believe it was all on the Xb1 because they didn't specify