I did read “A Brief History of Time: From the Big Bang to Black Holes”, but it made my brain hurt.
That said, writer Wilczek is a very sharp cookie, I doubt he would need to mislead you.
My choice of the word, mislead, was not appropriate to what I was intending to convey. It was a poor choice. For his sentence,
The black hole is enormous, with a radius of roughly 9 billion miles...
I was thinking the following when reading the sentence:
This statement will have most readers incorrectly assuming that a black hole would have an actual radius of 9 billion miles.