Source code for https://victorfont.com/genesis-deactivate-superfish-menu-support/

genesis-accessibility.php

<?php

//* Add accessibility support
add_theme_support( 'genesis-accessibility', array( '404-page', 'drop-down-menu', 'headings', 'rems', 'search-form', 'skip-links' ) );

genesis_superfish_enabled.php

<?php

function genesis_superfish_enabled() {
	return ( ! genesis_html5() && genesis_get_option( 'superfish' ) ) || genesis_a11y( 'drop-down-menu' ) || apply_filters( 'genesis_superfish_enabled', false );
}

genesis_superfish_enabled_filter.php

apply_filters( 'genesis_superfish_enabled', false );

sp_disable_superfish.php

<?php

add_action( 'wp_enqueue_scripts', 'sp_disable_superfish' );
function sp_disable_superfish() {
	wp_deregister_script( 'superfish' );
	wp_deregister_script( 'superfish-args' );
}