Removing selected Gutenberg block from post content in WordPress

Removing a custom block from content

<?php
add_filter('the_content', 'remove_to_do_from_content', 5);

function remove_to_do_from_content($content){
    if (has_block('custom/todo') === false) {
        return $content;
    }

    $parsed = parse_blocks($content);
    foreach ($parsed as $index => $block) {
        if ($block['blockName'] === 'custom/todo') {
            unset($parsed[$index]);
        }
    }

    return serialize_blocks($parsed);
}