Note the article's wording: "US natural gas futures plunged..." If the US can't export, there is increased domestic supply, causing the futures price to fall. If exports through the terminal resumed, US prices would rise since now global buyers are competing with domestic buyers, and prices between linked markets (e.g. US & EU) would equilibrate slightly. Also important to recognize that EU gas prices are much higher than US prices, so there is large demand for US->EU LNG shipments.