I have a 2018 ATAS DCT that I have ridden for over 10,000 miles and have not noticed either leg getting particularly hot. Some of my riding included Southern Mexico in over 38C (100 F) weather and stop and go traffic. Maybe the larger tank and fairings allow the bike to divert the hot air away from the rider.
My Triumph Tiger 800XC would roast my right leg under the same conditions.
I would suggest that because the DCT transmission is so smooth, seamless and places no extra strain on the gears, it will run cooler. It will not 'add' heat.
However.. Because it's physically larger, wider than the standard bike, you might be a little more conscious of the engine oil heat, especially in warmer/hot climates. Wearing thinner protective gear without liners.
So far I've not experienced any difference.. These bikes run hot, or at least they seem to compared with other bikes I have owned. That's the only factor that I have experienced that sets my own bike apart from those others.
I live in Florida and it has been hot almost every day since I bought my ATAS DCT. This is on of the hotter bikes I've ever owned when going down the road. The air from the radiator is dumped right on my legs at cruise. The upper right side of the bike case is very hot and it positioned just "wrong" so as to almost burn me a few times.
I have a few other ADV bikes and while cruising on the highway none of them dump the amount of heat I get from the radiator from the AT. It is as though Ducati and BMW actually put some thought into where the hot air flows when moving. They all are hot when at a stop and the fan kicks on but only my continues the bathing me in hot air when cruising down the road at 70+ mph. If I put my legs WAY out from the bike and into the airflow it is finally closer to what my other bikes are like.
Hate to be Captain Obvious here but;
We are sitting on top of and have our legs wrapped around a fairly large gasoline engine, you GOTTA expect heat of some kind. That said, you shouldn’t expect to smell flesh burning either. But you are going to get and feel some kinda heat from somewhere...