Change Author Link to Author Profile Posts Tab.

yz-change-author-link-to-author-profile-posts-tab.php

/**
 * Change Author Link to Author Profile Posts Tab.
 */
function yz_change_author_page_to_profile_posts_tab( $link, $author_id ) {

    if (  function_exists( 'youzer_is_active' ) ) {

        // Get Author Posts Tab Url
        $author_posts_tab_url = bp_core_get_user_domain( $author_id ) . 'posts/';

        // Redirect.
        return $author_posts_tab_url;

    }

    return $link;
}

add_filter( 'author_link', 'yz_change_author_page_to_profile_posts_tab', 999, 2 );