They aren’t fediverse-first, and they’re French-based/French-focused/French-language-only, but Blast is an online, video-first news station that hosts their own peertube instance (video.blast-info.fr) where they upload everything as well as putting their videos on YouTube. They also have a mastodon account where they share everything they publish: mamot.fr/@blast_info.

So, it’s definitely possible to have news on the fediverse, but I don’t think we’re at a point where it can be exclusively on the fedi - even if the stations’ website is ActivityPub-enabled, the majority of the people that a news station would want to reach just aren’t browsing the fediverse, let alone have accounts here.