Compromised password?

Hello all,

Since about a week ago, Safari started showing the message "compromised password" on the start page. Is this message legitimate from apple?

The quoted red rectangle shows the public ip address of a computer that I used about 10 years ago and the passwords are no longer in use. The link "rescue your account" points to "ip_address"/.well-known/change-password.

I searched the web for this message and can't find any reference. What is this?

I'm using MacOS BigSur 11.2 and Safari 14.0.3 on an intel macbook pro.