wpgraft never reads Elementor’s data. There is no exporter and no importer anywhere in this. It reads the page as your browser rendered it: the real elements and the real computed styles on each one, at every width you ask for. It then builds that as a Shopify section made of theme blocks, with every style in one of the blocks’ own settings. Nothing that arrives depends on Elementor still being there.
A WordPress site moving its shop to Shopify usually leaves its best pages behind, because an Elementor page has no way into a Shopify theme. wpgraft copies what Elementor rendered and writes it into your theme as a Shopify section of blocks, with every style in a setting. The Elementor site stays live until the store is ready.