The "if it wasn't for Elon Musk buying twitter..." rubbish can get in the bin. My family and friends and colleagues all stopped using it and deleted it post Elon. My work's twitter account and most other accounts for organisations in my sector also left twitter post Elon.
News organisations such as the BBC, Sky, Channel 4 news, broadsheets and tabloids all must abide by a set a of standards, and will need to corroborate any facts before making them public.
Getting the news wrong is dangerous. Giving out all of the information immediately isn't always in the best interest of everyone.
I've looked now and there is plenty of information about this horrible incident available via many and varied news providers and platforms, including but not limited to:
BBC: Starmer calls Belfast knife attack 'horrific' as he thanks public for intervening (live)
BBC: Man arrested on suspicion of attempted murder after 'brutal' attack in Belfast
BBC: Man arrested after 'brutal' knife attack in north Belfast (video)
BBC: MPs respond to 'horrifying' Belfast knife attack (video)
BBC: Watch: NI Politicians React to 'horrifying' attack in Belfast (video)
Sky News: Starmer condemns 'abhorrent scenes' as man arrested over 'horrific Belfast...
Sky News: Belfast stabbing: 'It's difficult to comprehend the barbarity of this...
Sky News: Urgent Questions on Belfast knife attack in the Commons
Sky News: Belfast attack latest: Public urged to stay calm as Starmer condemns...
AND SO ON.