He's an FCC Commissioner, whose term lasts until June 30th, 2022, and can only be removed before then via impeachment, and making public statements on policy matters is perfectly normal for FCC Commissioner, even if those statements disagree with the policy positions of whatever party controls the FCC.

Indeed, the structure of the Commission is designed for that. Although Commissioners are appointed by the President and approved by the Senate, by law no more than 3 of the 5 can be from the same party. Traditionally for the two Commissioners not of his party the President nominates whoever the Senate leader of the other party recommends, and traditionally if that party is the minority party in the Senate the senators from the majority party pretty much rubber stamp it, so in practice the party that controls the White House gets a pretty free choice for three of the seats, and the other party gets a pretty free choice for the other two seats.

> The FCC is directed by five commissioners appointed by the President of the United States and confirmed by the United States Senate for five-year terms, except when filling an unexpired term. The U.S. President designates one of the commissioners to serve as chairman. Only three commissioners may be members of the same political party. None of them may have a financial interest in any FCC-related business.

He doesn't "work for" the FCC, he's a commissioner [1], which is a political position for which he was nominated. The role is inherently political and he's there to provide leadership. He's a Democrat, if anything this means he's more likely to find a higher role in the future.

1. https://www.fcc.gov/about/leadership/geoffrey-starks#bio

wow, bold move on his part.