The FCC derives its powers from the Communications Act of 1934 (before Sputnik) and a few Supreme Court cases, none of which have to do with satellite communication. That the FCC has jurisdiction over terrestrial radio spectra does not give it the right to create additional requirements for communication with orbital satellites even if there are US-based ground stations involved.
> The FCC derives its powers from the Communications Act of 1934 (before Sputnik)
...which has many post-Sputnik amebdments, but specifically the FCC role regarding policy for communication satellites comes from the Communication Satellites Act of 1962.
Right. The text of the report literally states that the guideline isn't legally binding. They condition their approval of radio operations (Which they do have power over) on planned compliance with the guideline.