I’m fairly sure they are monobloc. If you look at the bloc in between the barrels, underneath the extractor/ejector claws, there is no joint visible there. If these were chopper lump (demi-bloc) they would have to be jointed somewhere and there should be a fine line of the joint visible there.
Also Kreighoff was one of the first companies to go for monoblock construction on their O/U shotties. Given that if the maker has monobloc machining capability it is much cheaper to make it versus demi bloc I’m fairly sure they would stick with the monobloc construction. Which one is better? Perhaps a good conversation to have by the campfire (after an uneventful, dissapointing hunting day).