I'm sure it doesn't really matter who claimed it. Surely many scientists believe it. I'm presently reading a book by Bill Bryson entitled "A brief history of nearly everything". It was published in 2003 by Broadway books. Here's a quote from his book I found on page 10:
It is natural but wrong to visualize the singularity as a kind of pregnant dot hanging in a dark, boundless void. But there is no space, no darkness. The singularity has no "around" around it. There is no space for it to occupy, no place for it to be. We can't even ask how long it has been there - whether it has just lately popped into being, like a good idea, or whether it has been there forever, quietly awaiting the right moment. Time doesn't exist. There is no past for it to emerge from.
And so, from nothing, our universe begins."
I recognize that Bryson is no scientist, and I can't say I'm certain at this point where he got his information, but I can only imagine that it must have come from scientists' general consensus.