They're just being cute with the assumption of the interpretation between numerals (digits) and numbers (complete integers).
in binary/base two, "two" (2) is represented as "one-zero" (10), NOT "ten"
in octal/base eight, "eight" (8) is represented as "one-zero" (10), NOT "ten"
They were using our common interpretation as "one-zero" as a value of ten (the integer), while being pedantic and really meaning "one ten and no ones", base ten-speak.
So, in a purely Eddie Haskell kinda way, they are correct, but still (intentionally) misleading in the terms of commonly understood--and perfectly acceptable--useage.
(00100)