Some US companies have made some plans for modest expansion. Those expansions will only be profitable if steel stays at it's current high prices. If steel stays at it's current high prices, steel-containing consumer goods will also stay at higher prices. There is nothing in the article about those things leading to lower prices for steel in the future. Backstopping the US domestic steel industry via tariffs may help steel industry jobs, but it will very likely hurt steel-reliant industry jobs.
Trade wars are good, and easy to win!