Around here we'd call that a road, not a trail. I could drive a car on that road and wouldn't bother with my Jeep.
I don't know if I'd drive a car that I own on it, but I'd give it a shot with *a* car, though a truck would be much, much better, especially if conditions are variable. Regardless, it is certainly a two track and people have ridden it with gravel bikes, though I'm not sure I'd feel comfortable on it with drop bars.
I don't think anyone would argue it being anything other than a 2 track 4x4 road, but it certainly qualifies as a XC Ride on a bike where some experience in ruts, rocky sections, and loose and sandy terrain, both up and down, would certainly be a variable when it comes to covering 100 miles in <6 hours, supported by the fact that the two fastest known times were done on F/S Bikes (where an even lighter XC hardtail would seem to be an advantage).
As far as standardizing the course, it is a circle and the same elevation gain/loss no matter where you start. I suppose an organized race of some type would be the only official means of record setting a standardized route. Until then, it's just bragging rights and accolades and obligations for energy drink sponsors.