That's amazing.
It could really be him. Maybe just his first thoughts on the subject he made public.
He might have gathered some information on the topic, than forget about it for a year or 2 started thinking about it again, maybe even write some lines of code. Throw them away, have some personal stuff he has to take care of, has stress with his job, randomly found something that he could use, work on the code again, throw it away, and so on ...
After all, who ever Satoshi is, he has a live besides Bitcoin.
It could really be him. Maybe just his first thoughts on the subject he made public.
FOr some reasons I don't think it's him :p and let's say it's him , did Bitcoin took him over 7 years to develop it ? 
(guessing that he started in 2002)
I don't think, he would work 7 years on it fulltime. That is just a misconception on how an idea develops. (guessing that he started in 2002) He might have gathered some information on the topic, than forget about it for a year or 2 started thinking about it again, maybe even write some lines of code. Throw them away, have some personal stuff he has to take care of, has stress with his job, randomly found something that he could use, work on the code again, throw it away, and so on ...
After all, who ever Satoshi is, he has a live besides Bitcoin.