I have been playing golf and working at a golf course for 20+ years. Your comment above is a load of . That is not the case, you could never prove this. It is a fabrication because you feel slighted by the data in the chart.
People get so emotional at the mention of distance. I guess its an ego thing, is someone less of a man if their best drive only goes 225? Well guess what people, driving distance and manliness have no correlation what-so-ever. So get you panties unwadded and get on with your life. Many, many great men could not hit a golf ball at all.
This chart, while not perfect, shows very valid data. There is most definitely a correlation between swing speed and handicap. How many guys on the PGA Tour have swing speeds under 100MPH? How about none. Why, because in general better players swing the club more efficiently, generating higher swing speeds and better contact with the ball. The only problem with the chart is it looks to show that those with high swing speeds always have lower handicaps. That is not necessarily true. Swing speed is just one of several factors in the make up someone's ability, but it is still a factor.
I play many rounds with guys who do not possess great swing speeds. They struggle from the fact that GIR affects score more than any other factor. They hit the ball 225yards with a driver. That means they come into many par 4's with long irons, hybrids, or fairway woods. Its difficult for even the most accurate player to consistently hit greens using those clubs, and even more difficult to hit the ball close to the hole. Many of them have fantastic short games, but that just means they are having to one putt for par a lot, and have very very few legitimate birdie looks.