... the wording of your post makes it sound like he's suggesting the D500, generally speaking. over the D5 and/or the two Canon's when he's not...
That would be directed at me. I will look again at the video, but we do seem to see something different.
After talking about pixel density and anti-aliasing, recommendation for BIF
6:41 You will get better sharper results with this [D500] I promise
then going on that the better choice is the 5DS-R when no action
7:20 [D500] produces vastly better results then the D5 or 1DX MKII
7:37 buy a 5DS-R and D500 for less money then the D5 or 1DX MKII and I promise you will get better results
8:28 [the D5 or 1DX MKII] sensors are good for fast action and good for low light, but not good for detail, Myself I'm always driving for more sharpness ...
8:43 photographers will make great pictures with these [the D5 or 1DX MKII] but it is not because they choose the right camera body
=> This last implies very strong he thinks the D5 or 1DX MKII are the wrong camera bodies
9:06 if you want the results; you will take my recommendation and get yourself a 5DS-R or D500
Now the title might be misleading since he recommends the 5DS-R, but for someone who (sometimes) needs fast frame rates that is not a valid option, the only one that remains from his conclusion is the D500.