I am not a random user, but the creator. The dependencies are managed via standard requirements.txt file, which is stored in the Excel workbook itself. When you open xlwings Lite with the workbook, the dependencies are installed from either PyPI or Pyodide's own repository (after the first download from the browser's cache).

Direct db queries are indeed a restriction of Wasm/Pyodide, but there are more and more databases offering a HTTP layer. For example, Supabase has this built-in via PostgREST. For Oracle, there is Oracle REST Data Services (ORDS). Ultimately, you can also build your own little proxy server, although that's a little bit more work, but might still be worth it for company-internal use.

No, this is for Excel only, but it does work with the free online version of Excel. I think LibreOffice has support for Python via PyOO.