So there's a dead body with blood everywhere.
They don't know who the man is, or who killed him.
And they don't know how he died. Presumable he dies from loss of blood. But there are no details. You'd think the blood would come out of a wound or out of his mouth. Again, no details.
So there's one conclusion which can be made:
The whole story is bullshit. And the reason for it is to be able to declare the whole playa a murder scene to impede the people who investigate the bullshit cleanup efforts.
Burning man is bullshit. The "people" who go out there absolutely destroy the environment, and then they pay off the authorities to cover it all up. This is absolutely fact. They've been having trouble keeping people from investigating these facts, so now they've come up with a way to disguise their authority inside a murder investigation.
Burning man has to stop.
I have not had time to watch this, its like 2 hours long but it basically describes everything you just said. Also, apparently a ton of "burners" will buy cars/RV's/etc but never register them in their names and then just abandon them in the surrounding towns.