Your argument seems to center around you conflating various traffic calming measures. If you look at the pictures in the article you will see that they are depicting a speed table, not a speed bump. Speed tables are longer and gentler than a speed bump, and designed to slow the vehicles down less than a speed bump or speed hump. I agree that 35mph is a bit high for most speed tables, but 30mph would not be out of place for such a device.

Obviously hitting a speed bump at 35mph would be a very bad experience, but that's a different device than what's represented in the article.