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I wouldn't call that unreasonable, but it's not physically possible for a tent to even slow a bear down if it wants to get in. In my town, bears have gotten into houses and garages by tearing the front doors off their hinges, and by tearing through a house's siding and sheathing. I recommend car camping in bear country.
If people are interested look up bear proof trash cans - they’re basically tanks. Anything less doesn’t slow down a bear.
You would probably be safe hiding inside one of them. Toter's website has videos of testing they did with a brown bear (possibly a grizzly). He fucks it up pretty good but doesn't manage to open it.