Obviously one random early mined block could belong to anybody who just knew about Bitcoin since start, but does not prove it is Satoshi. Im amazed how much work Craig Wright put into the story and interiew but he does not deliver the only possible way how to prove it...
Sergio has done an excellent analysis of early mining. There is a distinct pattern to the early blocks that are virtually assured to be Satoshi's.
https://bitslog.wordpress.com/2013/04/17/the-well-deserved-fortune-of-satoshi-nakamoto/