I don't think they have any access or scraped data. The plugin let's me configure a JLCPCB DB path and it seems like it doesn't ship with one. I have no clue how to obtain that db.
You can apply for LCSC/JLCPCB API keys: https://jlcpcb.com/help/article/jlcpcb-online-api-available-...
You can apply for LCSC/JLCPCB API keys: https://jlcpcb.com/help/article/jlcpcb-online-api-available-...