The authority, exactly
This route does not exist without an employer that already holds a Home Office sponsor licence: a licence is what lets an employer issue the certificate of sponsorship (CoS) the application is built on. Sponsoring someone is not a guarantee the visa is granted. Post-Brexit, an EU/EEA citizen who does not already hold status from the EU Settlement Scheme needs this same permission like any other non-British, non-Irish national — Appendix Skilled Worker's rule text carries no EU exemption.