I was kind of wondering about that comment myself. I've never seen it mentioned, but I haven't read every review. We see lots of divers coming over from Oahu to dive who rave about the diving here. Oahu does have some decent wrecks you won't find in Kona.
KrisB:That's the first I've heard of that.
Most name either the Big Island (Hawaii) or Maui as the best for diving. Remember: Rodales has a reputation of being "purchased" -- send them enough free gear and/or trips and/or cash, and they'll say anything.
The only thing I've heard is the "best" about Oahu diving is the wrecks -- it has the most and the most accessible ones.