Yes, skin still on. I've read a lot on here about smoking it, including your tutorial, and that seems to be a plus.Skin still on? That's a plus sometimes.
I think "can be counter productive" is the key phrase here. When you add ice to a smoker to cool down the smoke.... you have to maximize the airflow, for example blocking the door or lid open, AND reduce the amount of smoke, and these two things help to eliminate condensation. Before sawdust smoke generators, I used a tray of ice when smoking butter and cheese, and with good ventilation I never had an issue with condensation. That said, I live at 5400' elevation in the Rockies and our relative humidity is very low. My statements could literally be all wet if I lived at sea level.I gotta tell you that adding ice to a smoker can be counter productive and ruin your smoking process.
Moisture from ice inside warm smoker will condensate and cover you salmon with droplets. I don't need to explain you the outcome of smoke on top of moist fish.....Ask me how I know......
Best way is to do it when its not hot outside, and with little bit of pellets or even better with dust.