Here's my two-bit Sherlock Holmes take on it:
The sound quality is as suspect as the video quality. Both are poor. The exhaust setup seems to be the key clue.
Now, the 675 has that WAY cool undertail exhaust. Logic says that if they were making a stripped 675, they would keep that. Why not? Why switch? No reason. An undertail ln a naked bike makes sense.
Now, all the 1050-motored bikes have high, side-mount exhausts - Tiger, Sprint, S3. So does this.
Hence, my amateur deduction.
Oh, and I have a Theory regarding the sound. Our current 1050 hits the rev limiter at around 9500 (learned the hard way). Now, Ducati and Aprillia, with their 1098 and 1000cc twins, manage redlines well above that - 11,000 for the Tuono. I'd have to look up bore/stroke and all that for all of 'em to figure out how much mass is being tossed back and forth, but it does seem to me that the Triumph is conservatively rated. It would make sense that a sportier Daytona version of the 1050 triple would rev higher, be peakier, sound different at speed, etc.
Just a thought.