Welcome to the Auth0 Community!
It appears that the behavior you’ve described is a known issue when using the New Universal Login experience. However, when using the Classic Universal Login experience, the password strength tooltip disappears after meeting all the conditions.
(Reference: How to remove the check marks if all are met - #3 by rueben.tiow)
I am investigating further why the password strength tooltip does not disappear for the New Universal Login experience.
Once I have an update, I will follow up on this post.
Thanks,
Rueben