Yes, it is a test of a theory. Albeit, the Dan Plan comes off more as a contrived and narcissistic blog that is made possible by his trust fund than the test of the 10,000 hour theory.
He clearly has the funds to DROP OUT from the real world and play golf for 6 hours a day. How is that "impressive"? All of us at TST would likely do that if we didn't need our paychecks in order to take care of our homes, families, savings, etc.
99% of serious golfers have the WILLPOWER and DETERMINATION to quit their job and focus solely on their hobbies. But only a handful are financially capable of doing so. This does not make the handful any better than the majority who cannot devote 6 years to golf while not worrying about family, bills, etc.
Based on his tournament results I would whoop Dan's ass shooting 85-85-85 LOL. But I wouldn't have a quip, because he already "quit his day job."
What difference does the financial situation make about this entire journey?