I assume this notification (linking to https://chat.meta.stackexchange.com/) I got a while ago is due to this change:
You can now participate in all public chat rooms on Stack Exchange
Join Chat to instantly connect and talk with the community
If so, it doesn't make much sense. I could already talk all public rooms - I have enough rep on many SE sites, SO, and Meta SE to cover each chat. And linking specifically to https://chat.meta.stackexchange.com/ also doesn't make sense in the context of "all public chat rooms on Stack Exchange".
