Taking steroids doesn't give you phenomenal skill and artistry. Steroids or no steroids Jones stands alone as the greatest there has ever been. He's just a phenomenal talent. Cormier knows this, hence his bitterness.
There is so much wrong with this, let me dive in.
Steroids might not give you the coordination to pull these things off, but it can give you the fitness to pull these things off, so, in effect, they can give you the coordination to pull these things off.
Allow me to give you an anecdotal example of what I mean. When I was 22, I could run flat out down the field (American football) on a streak pattern, and for shits and giggles I could catch the ball behind my back. Me at 39, I still have that coordination, I do not have the flexibility, speed, or basic all around physical conditioning to do that at anything more than a trot now. Put me on the Joe Rogan protocol of HGH and TRT out the ass, and I could probably do it at a solid running speed.
Steroids give you fitness. They give you strength. When you are at peak levels of fitness, your coordination isn't any better, but you can push the limits of your coordination further. Steroids allow you to train harder, recover faster, reach higher levels of skill and "artistry" because the steroids allow you to develop muscle memory at higher levels of work.
It's one thing to trot down field and catch a ball behind your back, and another to be in full flat out sprint. Likewise, it's different throwing a kick at someones head when you're going 30%, and throwing a kick at someones head when you're in the fight of your life, and losing the last half of every round.
Steroids allow you to perform in training at a higher level, so that when you've got a guy like DC walking you down, and brutalizing you for the last 2 minutes of each round, you have the conditioning and muscle memory to throw that kick at 100% effort in a very difficult situation. When you feel good, you perform good. When you feel great, you try shit you'd never try otherwise. When all the little stabilizing muscles, all the major muscles are in absolute peak condition, you feel like a lord, and your confidence is not only through the roof because you feel great, but you know your body is actually capable of pulling these high skill "artistic" moves off.
Simply put, Jones is a cheater. He's doping again. It's indisputable. If you bought the UFC's excuse, you don't understand how steroids work, or how testing protocols work. You don't suddenly piss hot for a steroid that has a ~16 hour half life, 18 months later, when all preceding tests using the same protocol were negative.