I am not familiar with Dr. Smith other than the first article, so he may have covered his position differently elsewhere. I am stating my opinion based entirely on the posted article. In that one he did not unambiguously state that he used the KJB exclusively. The above quote also leaves a bit of wiggle room. (Okay, so I am being picky!
) I would ask him straight up, "What Bible is your Final Authority?" Then I can tell you if he is KJBO.
To answer the post question: Yes, Dr. Shelton Smith is a Bible-Believer. Contrary to what some here believe, I do not think that only strict KJBOs are Bible-believers.