You’re welcome. You forgot to copy/add this:
add_filter( 'after_setup_theme', 'remove_new_wc_features', 99 );
Here’s the full code again.
add_filter( 'after_setup_theme', 'remove_new_wc_features', 99 );
function remove_new_wc_features() {
remove_theme_support( 'wc-product-gallery-zoom' );
remove_theme_support( 'wc-product-gallery-lightbox' );
remove_theme_support( 'wc-product-gallery-slider' );
}