That jumped out at me too. At first I thought, "does the author not understand how hexadecimal works, or is this merely a case of sloppiness or imprecision in his description?" Then I got to the part that said:

> There shouldn't be loads of them that start with an "A", or loads that end with ten "X"s, or anything like that.

This leads me to further doubt about the author's grasp of hexadecimal.