That is El Mirage dry lake bed. The two hills shown @ 2:29 & 5:44 are very near the lake bed, fairly close to the Springer's home, off to the NW of "Gyro Cove". I watched Ben S. "hover" in the lee side near the top of the larger one back in 2010 for several minutes in his Sport Copter as I was flying nearby him in mine. The winds were approximately 20-25 mph @ that moment.
The mountains off to the SW off the lake bed are the same scenery of the landscape as now, also. The "development" near the lake bed is amplified through the use of telephoto lens, making objects appear to be much closer than they really are, such as that large hangar. The bldgs. are about where the "Chicken Ranch" airstrip is (not to be confused w/ the Brock airstrip is a bit to the north of the CR). The CR appears to be where we see two of these Eich machines were parked. That white one appears to have had a Subaru EA-81 for it's powerplant.
Also, the fellow flying that gyroplane appears to horse his gyro off the ground in most of the take-offs, then leveling the machine by lowering the nose. The one exception was the sequence where he kept it nose-high & descended to land again in a short-hop.
The attempt to take off prior to when his main wheels departed their attachments looked to be where he saw the upcoming hillocks that dot the lake bed in some places. We can hear him throttle back down, but he either didn't apply sufficient back stick to use the awesome braking effect the rotorblades have, or he didn't have sufficient rearward travel in his controls to do so.
It appeared from the video's last seconds of action that the left main tire/wheel came off from hitting one of those hillocks. At rest on it's side, we see the two drag marks created from the landing gear mounts w/out any wheel/tire assembly.
My guess is that the pilot knew he had lost the left main wheel & he tilted the rotorblade disc to the right in order to place the machine's weight on the right wheel. But, then it also lost it's roundy thing, where it dragged the furrow in the hard-pan first, then the left one as the machine tipped over to the left, creating the furrow made by the left side not having it's roundy thing.
Ben S. has more to the story of the 2009 motorcycle fatality of Mike S.
I wasn't there, but heard the details from him. He might be willing to share it, since it's been over ten years. But, alcohol consumption to the excess, a borrowed motorcycle, & the big lie that he hadn't been drinking, coupled w/ Mike S.'s intimate knowledge of the lake bed's hillocks locations are all ingredients in the sad tale.