Could you please post a link to this announcement?
I don't think there is.
When they made KYC mandatory last year, I remember looking for announcement blog/post and found nothing. They did update their help articles, see this for instance:
— Do I need to verify my account to start trading?
As of November 9th, 2022, new users will be able to open a Bitfinex account at the Basic Access level in an access-only (view-only) mode.
@/Saint-loup's snap is i guess for some existing users who were to be purged at a later date. My test account is showing the same notice actually. Upon checking, I could only find that pop-up notification.
Ann posts: nothing
Blog: nothing
My email: nothing - or perhaps emails are delayed or something.