How to remove SKU’s from ALL products in Quick View – already remove from each product page

Please give this a try. I’ve modified your existing code to check whether it’s a product or not. Let me know if it works.

function sv_remove_product_page_skus( $enabled ) {
   global $post;
   if ( ! is_admin() && get_post_type( $post->ID ) == 'product'  ) {
      return false; 
   } 
   return $enabled; 
} 
add_filter( 'wc_product_sku_enabled', 'sv_remove_product_page_skus' );