I don’t think it necessary to do the password checking inside wp_authenticate_user filter as that check is done as the next step inside wp_authenticate_email_password(), where the filter is defined. You can see this in wp-includes/user.php#L168.
The filter parameter $user is either WP_User or WP_Error depending on if the user can be found with the username used when logging in. After the filter there is a if ( is_wp_error( $user ) ) check, which, if passed, is followed by a if ( ! wp_check_password( $password, $user->user_pass, $user->ID ) ) check. If this check fails, the password is wrong for that username, otherwise given username and password are good.
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