The torque number is lower however as previously he was over 800 lb-ft at the wheels but now is at 722 lb-ft at the wheels with a good looking curve:
The car moves and you can read all about his decision to swap in the S52 and turbo it from a past article.
After the dyno in the video he runs a CTS-V sedan and the M5 is at 28 psi of boost. The CTS-V gets the lead (blower torque) but the M5 pulls up top. Compare this run against a 750 whp CTS-V wagon previously.
Up next is a C6 Corvette with ~780 whp. The M5 is at 30 psi for this race and also has a passenger. It's a very good race with the M5 appearing to edge up top before getting off it.
Simply a badass E39.