How to remove author name and link from a shared link preview?

Question

This might help you. Add this script to functions.php. It will unset author from oembed preview. Remember Discord might already cached your URL. You may not get immediate result.

add_filter( 'oembed_response_data', 'disable_embeds_filter_oembed_response_data_' );
function disable_embeds_filter_oembed_response_data_( $data ) {
    unset($data['author_url']);
    unset($data['author_name']);
    return $data;
}

for more explanation head over here