We don't count PSNow titles as exclusives (at least the majority don't seem do, there's inevitably a minority that do), nor Wii titles WiiU exclusives, so i don't see why we would here.
I consider something like the MCC or TLOU:R a console exclusive since they're still exclusive to their respective brands (in one form or another), and they providing an experience completely out of reach for the PS3/360 (usually in the form of a significant performance and/or graphics upgrade), but that's not the case with the X1's BC. Currently it at most provides a modest upgrade through stuff like v-sync (making the performance hit worthwhile for tearing-heavy games like PDZ), but those upgrades aren't out of reach for the 360. It's simply that the games in question don't make very good use of the 360's hardware, usually because of their age.
