Simplified Attainable Speed Question

Yesterday I was surfing the internet and was reading the article on Wikipedia about Gregg Shorthand which I have read several times previously over the past several months. One thing that I took notice to this last time was that I am seeing conflicting info and was wondering if anyone could help clear it up. I was always under the impression that Anniversary AND Simplified (with years of diligent practice, of course) that both of these systems can attain 280 WPM. However when I read Wikipedia yesterday it was saying Simplified can attain up to 150 WPM. Any thoughts?

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