Remove action added in parent theme in Class [WordPress]

remove_action_added_in_class.php

//From here https://gist.github.com/azizultex/dd55c5c0518a427ae3a5552f683eb29b Modified -> Mind the comment to make it work with WP > 4.7
function remove_filters_for_anonymous_class( $hook_name = '', $class_name ='', $method_name = '', $priority = 0 ) {
    global $wp_filter;
    // Take only filters on right hook name and priority
    if ( !isset($wp_filter[$hook_name][$priority]) || !is_array($wp_filter[$hook_name][$priority]) )
        return false;
    // Loop on filters registered
    foreach( (array) $wp_filter[$hook_name][$priority] as $unique_id => $filter_array ) {
        // Test if filter is an array ! (always for class/method)
        if ( isset($filter_array['function']) && is_array($filter_array['function']) ) {
            // Test if object is a class, class and method is equal to param !
            if ( is_object($filter_array['function'][0]) && get_class($filter_array['function'][0]) && get_class($filter_array['function'][0]) == $class_name && $filter_array['function'][1] == $method_name ) {
                unset( $wp_filter[ $hook_name ]->callbacks[ $priority ][ $unique_id ] );
            }
        }
    }
    return false;
}

//after_setup_theme or init to get it work -- as parent theme is called after child theme (we can't remove what hasn't been added yet)
add_action( 'after_setup_theme', 'sz_remove_hook_from_parent_theme');
function sz_remove_hook_from_parent_theme(){
    //Stop fonts in the theme, all fonts that need to be preloaded should be added to the related WP Rocket section
    remove_filters_for_anonymous_class('wp_head', 'Wpshop\Core\Fonts', 'wp_head_preload_fonts', 10);
    //For actions added without class:
    // //Stop preloading thumbnail for single posts -- it's not used in the post template, only for archives
    remove_action( 'wp_head', 'reboot_preload_thumb_image', 10 );
}