I have read of Father Miliks theories and while they are certainly interesting,they are in no way conclusive. I believe they came about in the 1950's or thereabout and I'm pretty sure that they have been or are being researched for their validity.
Oh yeah, it's a funny story. After Peter's ossuary was found in Jerusalem and confirmed by Milik, the Vatican immediately came up with a set of bones they found in a wall and were Peter's, as they said. Well, on further study it was a collection of animal bones and the bone of a woman. So the Vatican went back and immediately found another set of bones somewhere there, that the pope's personal archaeologist confirmed was Peter's, but the archaeologist wasn't named and no one else is allowed to study them. Now that's desperate. lol