My first thought is that the driver would have had to mash down pretty long and hard on that "mistaken" brake pedal to get up to 90 mph and fly off the cliff. Doesn't sound reasonable to me.
But if you were to look at it like the vehicle was driven off the cliff at a slower speed than 90 mph, then the 90 mph speed could be the result of mashing on the accelerator after the back tires left the ground. But to me, instinctively a person would mash the brake pedal even if they were airborne. It's a reflex when you want to stop the car. So this scenario doesn't sound reasonable to me either.
This looks like a suicide and 7 murders if the driver did this intentionally and on her own. Maybe there was an argument and she got angry and lost it. Snapped and punched it after it was too late too stop.
Or maybe it was a lesbian suicide pact and 6 murders. The two wanted to end it all and take the kids with them.
At 90 mph speed, this was not an accident, so by default it was a felony reckless drive of some kind. The same conclusion the CHP came to.
I have no reasonable argument against your conclusion.
Suicide/homicide. The 90 mph “peg” defines it. Foot held to the floor. I’d like to know the speed when the vehicle lost traction. That would be known in the OBDII data . . .
Throttle position sensor data would confirm it.