I'm just trying to work this out ....
He's supposed to have had 7500 coins and he mined them in a week on his laptop back in 2009. At one block every 10 minutes each generating 50 coins that's 300 coins an hour, 7200 coins a day and 50400 per week. 7500 of 50400 is 14.88%. Now maybe I'm being dumb and I've made some stupid mistake but if I haven't it does not seem credible to me that he had about 15% of the hashing power mining bitcoins back in 2009.
M
he said a week , maybe to dramatize , could have been 10-12 days, and at that time you couldn't say that there was hashing "power" , the few who tried this weren't keeping their computer on 24 hours except for a few.
Still , it is possible.
Let's call two weeks. That would still mean he produced 7.44% of all the bitcoins produced in that time. That means that he would likely been among the first dozen or so early adopters. Let's say that he was among the first 100 adopters. It's not impossible, but I do not find it credible.