Having not listened to the conversation, I am hesitant to say that he was trying to upsell you, simply because he did give you accurate advice, at least in regards to the strength issue. That said, he is wrong. A .30-30 is plenty for black bear, and a lever action is quite a bit faster and handy in the bush. If your looking for a gun to actively hunt black bear, then no, I probably wouldn't say a .30-30. I don't think I would recommend a .243 either, but I would recommend a good bolt gun owing to the general superiority in terms of accuracy.
On this note, keep in mind that accuracy has become something of a nebulous topic. Magazines and gun forums tend to call anything that isn't sub-MOA "inaccurate", even if only subconciously. Craig Boddington wrote an article a couple of years back in which he said that a rifle that was just MOA was "pedestrian". His point was valid, as the rifles of today generally are extraordinarily accurate as compared to those of even 20 years ago, but I just disagree that MOA is all that important for the average shooter. For me, if I can shoot consistently into a max of 4 inches at 200 yards, I am perfectly satisfied with that rifle. I am more concerned about consistent, functional accuracy than I am with gilt-edge accuracy, although there is certainly nothing wrong with gilt-edge accuracy.