Looks like you may need to use a custom hook unique to Elementor Pro: https://code.elementor.com/php-hooks/#elementorfrontendbefore_enqueue_scripts
The below example is un-tested but modified for your use case.
// Note: I think all you need is to dequeue the style to remove from the page
add_action( 'elementor/frontend/after_enqueue_styles', function() {
if ( is_front_page() && !is_user_logged_in() ) {
wp_dequeue_style( 'elementor-pro' );
}
} );