What happens if you avoid conflating cost and price and also assume that pricing is vaguely competitive, rather than cartoonishly favorable to tariffs?
Assuming that pricing is vaguely competitive is conflating cost and price, since competition would cause margins to be thin. The general issue is that domestic production often has a higher cost, e.g. because domestic labor is more expensive, or because foreign production has already amortized some long-term fixed costs over past sales that a new domestic manufacturer would yet have to recover over future sales. It then needs a higher price, at least temporarily, in order to be competitive, which is what tariffs do.