Find a quote where he said that. You won't. He has always said it was his colleague.
https://youtu.be/5DCAC1j2HTY?t=22s"interviewer: so you are going to show my that satoshi nakamoto is you?
craig: yes"
"interviewer: so you can say hand on heart to me 'i am satoshi nakamoto'?
craig: i was the main part of it other people helped me"