What do they mean, "once"?

From today’s Seattle Times:

Yellowstone National Park, once the site of a giant volcano, has begun swelling up, possibly because molten rock is accumulating beneath the surface, scientists report….[T]he flow of the ancient Yellowstone crater has been moving upward almost 3 inches per year for the past three years… more than three times faster than ever observed since such measurements began in 1923, the researchers said.

There’s nothing “once” about the Yellowstone Caldera, any more than there is about Mount St. Helens. Neither is classified as extinct.

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