Didn't Crucible confirm that Kizer is buying S35VN from them or something along those lines? That, combined with, I believe, a couple of people stating that it's similar to S35VN, or not worse, and the lack of complaints (Lots of people would probably be all over this if it didn't perform as well as S35VN.), and it seems very likely that they are indeed using the advertised steels for these knives.
They confirmed they're buying crucible steel however how much, which one is not known.