Don't listen to
I installed the plugin and after the first login, I was invited to enter a new password. As a test, I entered a very weak password, and indeed I got the message that it was too weak and would not be accepted.
However, without entering a stronger password, I was still able to navigate away from the page and create and publish new content.
This is a great plugin for the simple task of forcing users to change password on first log in.
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