wpgraft never reads Webflow’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 Webflow still being there.
This move crosses platforms: Webflow is a hosted design tool, Shopify is a hosted store, and neither reads the other’s files. You copy from your published Webflow site, which is an ordinary web page, and it is written into your Shopify theme as a section of blocks. Your Webflow project is untouched and stays live while you rebuild.