Removing selected Gutenberg block from post content in WordPress

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<?php
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add_filter('the_content', 'remove_to_do_from_content', 5);
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function remove_to_do_from_content($content){
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    if (has_block('custom/todo') === false) {
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        return $content;
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    }
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    $parsed = parse_blocks($content);
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    foreach ($parsed as $index => $block) {
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        if ($block['blockName'] === 'custom/todo') {
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            unset($parsed[$index]);
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        }
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    }
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    return serialize_blocks($parsed);
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}