First to publish matters, but GPT-3 is neither necessary nor sufficient to achieve that. If you're producing fake news related to a press conference, speed of content generation is entirely unimportant because you don't have to wait for the press conference to start to write the fake article/update/tweet. If you care about fidelity to the message of the press conference, I don't see many situations in which a human who has anticipated the likely message(s) of the conference and therefore has pre-drafted paragraphs about "striking a conciliatory tone" and "confirmed the reversal of the policy" ready to select and combine with a choice quote or two as soon as they're uttered isn't significantly better (and as quick as) GPT-type models prompted by the speech-to-text of the press conference. Sure, more reliable publications will want to stick more validation and at least wait for the conference to finish before summarising its message steps in the way, but those apply to bots as well as journalists (or not, for the publications that prioritise being first over being right).