I think that the article is true.
First of all, the company which published it can be reliable and the write also exists.
And I found some other sources. The article of Forbes also mentioned that Meta would collect interactions with its AI tool to provide user’s preference on social medias. However, users can choose how Meta use their information with AI tool. In addition, users in some countries such as UK, EU and South Korean will be excluded in this update because of the protection of their privacy. (computing also mentioned)
Additionally, Fortune said that Meta would make your chats with its AI assistant part of its advertising machine.
According to these articles, the update will begin in December 16, and Meta noticed it to users yesterday in October 7.
The former article said that collecting the privacy information would be up to users. On the other hand, the latter had a bias that the update of Meta would be dangerous. In my opinion, more people should have a sense of crisis toward both of the social media and AI, so the letter didn’t exaggerate.