I don't understand this "leetcoders produce bad code" meme. Is there something about being good at whiteboard interviews that makes you bad at writing clean cod

I don't understand this "leetcoders produce bad code" meme. Is there something about being good at whiteboard interviews that makes you bad at writing clean code? Outside Google, I've seen plenty of terrible code by people who would fail FizzBuzz. Within Google, I've seen way more attention paid to code quality and system design than at any other place I've worked at.