alt Hacker NewsArgon has also been publicly available for the same amount of time for Pro users.
I don't understand why HN is so surprised to have an announcement for model existence and a follow-up announcement for model availability. It's really not that unusual, as you say Anthropic has done the same, probably others too (though I can't remember)
Because Google’s models have been a disappointment for so long (Argon tentatively excluded) that nobody is excited to read a press release from them stating a new one is coming out “soon.” There’s no hype when your product to date (tentatively pre Argon) has been inferior for a “long time.”