I just read the article.
Basically Meta can see the last 5 messages if the recipient reports the last message to Meta. The rest is end-to-end encrypted. Always.
If you send stuff to your trusted friend, Meta can't see anything unless they're not your friend and report your message to Meta.
Don't get me wrong. I haven't used WhatsApp, Fb or Instagram in years. But I think it's actually a good thing to offer a way to report illegal content.
None of that applies to FB and Instagram. They have no encryption whatsoever and all your messages are read by an AI.