Yes. Kool said tastes goooooood. Must. Drink. Kool. Aid.
No kool aid required, just a little bit of critical thinking.
RG has been driving trophy trucks for... maybe 30 yrs or more? During that time, he's been driving through all kinds of desert terrain at speeds up to 130 mph. Those are all facts. So it seems reasonable to surmise that he would know what well tuned, well designed shocks handle like. He's obviously not the only driver who has this sort of knowledge. Human nature being what it is, most people take the easiest route. They would take the best shocks they could get from Fox or King and rework them until they get the handling performance they wanted out of them.
But what if someone feels he can get better performance from a different design? A design that Fox and King don't make? So he designs his own shock that does perform at the level he wants. That's probably the hardest way to get what you want, designing it yourself and making it different somehow. That's what RG did, then he scaled it down slightly for the Speed UTV.
Are these shocks tuned to handle perfectly in dunes or desert trails without adjustment? No. However, the difference isn't as dramatic as a F1 shock vs a desert shock. There can be enough range in the adjusters that the shock can be adjusted with the external screws to do very well or excellent in both types of terrain. I had my 8 shocks on my sand rail (it's actually a Foddrill dirt car) adjusted to the middle so that there's enough adjustment in the bypasses that I can get a great ride in both types of terrain.
I'm pretty confident that RG knows a lot more than I (or any of us) about shock tuning and has put enough range in the adjusters to get the performance he wanted both in the sand and dirt. As Sand Shark pointed out, this is aimed at a specific type of terrain, not as general purpose as other brands doing mudding, forest trail riding, etc.
RG has spent a lot more time testing and tuning these shocks than I ever expected and I'm pretty confident he wasn't just goofing off. He drove around giving people rides, which gave him performance data on 4 passengers vs 2 passengers. That also makes a huge difference in shock tuning. So I really don't feel there's any Kool aid involved. Just plain old fashioned experience, hard work and intelligence.