The design on the sidewall makes them look much more aggressive than they really are. If you look at the overall tread pattern, they're not overly aggressive...compared to a BFG AT/KO...which are pretty quiet for what they are.I find it very hard to believe those are as quiet as the Forteria's.
Also, The WK2 is loaded with sound deadening. Would take a big difference in overall tire noise to notice a significant increase in the cabin....with the windows closed obviously.
I don't have experience with these personally, but the compound of the rubber has just as much to do with road noise as the overall design of the tread.