I am right handed, and load with my right hand.
I don’t think other ways are wrong. In fact, wish I could keep the gun in my firing grip. That method just doesn’t work for me.
Holding the gun by the cylinder in my “wrong” hand lets me control the cylinder better. My left hand fingers are curled around the cylinder as it comes open, so I can hold it firmly while striking the ejector rod and hold it from turning during loading.
I don’t like using the thumb of the hand holding the cylinder to press the ejector rod. I like using the other hand (right, for me) to give a sharp strike on the ejector rod because sometimes it takes… yeah, a sharp strike on the ejector rod to free the empties. Some may say that’s not a problem unless using high pressure ammo, but there are other reasons. For one example, a split case with any ammo can grab the chamber walls tightly.
Keeping the gun in the firing grip sounds like the clearly superior way, and could be the faster method. When I do that, I don’t have a GOOD way to keep the cylinder secure. Poking my trigger finger through the cylinder window to the cylinder doesn't feel good enough to me.
I want a solid hold on the cylinder.
That not only gives me a better hold on the cylinder, but on the entire gun. Holding the gun in a firing grip sounds solid, but extending a finger to the cylinder weakens that grip. Also, if I’m holding by the grip/stocks, when I’m hitting the ejector rod or shoving new rounds in, it feels like I’m trying the lever the gun out of my own hand. Holding by the place of this activity, the cylinder, I don’t have that feel. It feels more solid and in control.
I also like to hold the revolver in kind of close and off center toward my right for the reload because it is more secure and lets me stay kind of tucked in tight if space requires it (loading when sitting behind a steering wheel?), and gets the gun closer to where my speedloaders are worn. For me at least, I can get the gun in closer and steadier holding it by the cylinder with the left/weak/support hand.
If nothing else, holding the gun by the cylinder in my “wrong” hand feels more natural to me.
I disagree with one part of the article. He says it’s easier to hold the revolver straight up or straight down when you keep it in the strong hand. Maybe it’s just me, but I don’t find that to be the case.