That isn't a double wall. The picture just makes it look like that. Most newer mods now support 24mm and 25mm so I'm not sure why they chose a 22mm Diameter. Maybe this 22mm will cater for those mods that don't yet support 24mm.22mm is too small a footprint for me. I would rather a 24mm or 25mm and a bit shorter. 3.5-4mm is fine with me. But if that is a double wall, I wonder if they have lost juice space/capacity doing that? Just make it a little shorter and a little wider.
It will be interesting to see what the deck configuration is and the purpose of the double wall (how it functions).