I don't think that blocks video ads.
Yes they are. Apparently the number skip is equivalent to numbers 3 - 58,300. The number A is equivalent to numbers 58,301 - 87,962. Few makes up the remaining, which is 87,963 - 99,999.SIMPLE MATH. You don't understand it.
That's only if you are categorizing numbers by letters, which is not what he meant.