There is literally books written about Ali and his past. Why are people making out like Conor is one making this up.
Even #40 on youtube trending is a deep analysis of what Conor said last week, and delves deep into Alis past, you can watch that part here:
https://youtu.be/gzhJ9PdY77c?t=1195
So no, the source is not Conor. It's multiple books, news articles, investigative journalists, the NYPD, the FBI, and the United States Government.
This is actually completely incorrect. Khabib's manager was an NYPD informant during the follow up investigation to the attacks on 9/11/2001 and the resulting NYPD terrorism task force as described in this book.