I’m no expert on French politicians, but a very quick wiki/google search reveals that the former prime minister, Élisabeth Borne was implied to be a lesbian by a French publication that she later sued, denying their assertions. I would hardly call that “openly gay” and it’s pretty scummy of that publisher to invade someone’s personal life like that.
As for the comment on US journalists, the BBC was also reporting Gabriel Attal’s appointment using the language “openly gay” as early as 06:03 UTC.
As an American I have plenty of bones to pick with the media here, but your comment comes across as ill-informed, bashing on American journalists just because rather than for any substantiated reason.