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Honestly, I am an oddball and always uses side-by-side doubles but configuration is the same... sort of. Generally speaking, on a double barrel, you will have one barrel choked "Full" and the other choked "Modified" or "Improved". It depends on the gun and this applies to fixed choke configurations.
Others like this one are not choked at all, both barrels are the same and are machined and threaded to accept insert tubes or screw-on tips so the shooter can customize the choke how he thinks fit for the situation. The extended tube choke he has in the top barrel is more a marketing gimmick than anything else. Some would argue, but the idea is that the shot load is choked down in a more gradual fashion and produces more consistent patterns and less deformed shot pellets. Most guys just like them because you don't need a wrench to swap them...
Why he is only using one is open for discussion. I see this from time to time when guys borrow from another shooter because they don't have what they need on hand, who knows in this situation.
From what I see he’s not even “dressed” for skeet shooting. Secondly the shotguns I’ve fired never smoked like that. And third there doesn’t seem to be any recoil. Plus he didn’t pee himself when the gun went off.