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It may be a case of a journalist not really writing it quite correctly. I googled and found this Wikipedia article: https://en.wikipedia.org/wiki/Evolved_antenna … -- there it said "[t]he resulting antenna often outperforms the best manual designs [...]". It didn't say anything about "optimal" results.
Yes, it is actually a quite famous example for applied evolutionary algorithms. (I didn't mean to imply that this is a case of con artistry. It's clearly a case of a science journalist/communicator who doesn't actually know the topic very well, or don't care much about accuracy.)
When I saw your tweet, I got an impression of a Mr. Know-It-All spouting nonsense...or maybe you're right! Can't tell! So I dug around...you know the rest 
I must be careful about so many thing these days. I _do_ know about evolutionary algorithms...even played with it some!
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