I’m not by any means sure that they are accurate on this but “if” something exists at this distance, it would likely be composed as the illustration demonstrates as the “dust” ring around the early sun sorted itself out. Heavy elements close to the sun, lighter elements further out.
It will be interesting to follow this speculation.
Nobody is sure about the entire story. But getting something even close to what the earth is, is not easy, if the typical fate of water is these hot snowflakes.