If you've dismissed the dialog in the web interface, it should no longer show up from command line interaction. But the one about ssh keys showed up for me as well.
I did dismiss the dialog
Anyway, I just set that broadcast message to time out on 2025-01-08 (next Wednesday) so if you see it after that, let me know.
Given that it's the holidays and the New Year, maybe Jan 08 is a bit too soon for people to notice. I guess, though, they'd also see the messages on the web interface eventually. I don't mind see the messages for a while longer; it doesn't prevent me from pushing things.