Apparently Dan did not read the fine print. Gladwell's own quote, "There is a lot of confusion about the 10,000 rule that I talk about in Outliers. It doesn't apply to sports."
I take Dan's effort as nothing more than his own publicity building. Good for him if he can build his publicity but bad if he actually believes he can become an "expert" or "pro" in golf. Also let's now lower the standard of expert. Scratch is definitely not an expert in golf as Gladwell's examples focus on really really exceptional larger-than life human beings. Expert in golf in Gladwell's example would be Tiger Woods or Jack Nicklaus, not a scratch golfer.
This is one bad case of gross oversimplification of success IMO. It's like almost saying pure ball striking will make one to become a tour pro. Yes, it is a prerequisite but the entirety of becoming one.
Wow, yes, I'm glad it was clarified. He acknowledges that you need talent for certain activities.
"There is a lot of confusion about the 10,000 rule that I talk about in Outliers. It doesn't apply to sports. And practice isn't a SUFFICIENT condition for success. I could play chess for 100 years and I'll never be a grandmaster. The point is simply that natural ability requires a huge investment of time in order to be made manifest. Unfortunately, sometimes complex ideas get oversimplified in translation."
Time for Dan to go back to Photography and golf as a fun activity.