He kind of contradicted himself though, he said that he was part of a group of people who were the creators of Bitcoin. Implying that 'Satoshi Nakamoto' is more than one person.
the satoshi pseudonym is of one person... ONE
but satoshi and other people like Hal finney and a host of other people (all with their own pseudonyms) helped program bitcoin.
even now today there are hundreds of people programming aspects of bitcoin.
but with all that said.
craig wright is not satoshi, nor any other prominent coder of the early days
we can define satoshi as the guy that had the idea of POW
this is going to literally be impossible to prove by any means.
so we will never be 100% sure who had the original idea.
the best we can hope for is finding a person with access to the keys which can move coins from early blocks ( preferably the first block )
that would prove they at least played a role in the very beginnings of bitcoin, but still cannot prove that they had the POW idea that makes
all this blockchain thing GO.