Not to be rude, my friend, but thet description on that site is not worth a damn.
There is definitely propylene glycol and artificial sweeteners along with artificial flavours in Captain Black AND the Lane equivalents. (There is not really that much difference between them)
All pipe tobacco is heavily processed, but that is why it is so palatable compared to other forms of tobacco.
These aromatics, however, are bigger offenders than many Virginia, Burley, or "English" blends on the market. These tobaccos tend to be much more subtle and they are more likely to use natural ingredients. (Such as liquorice or molasses) Still, there is likely some sort of humectant or antifungal in every single brand on the market, and they do not grow these on trees I assure you!