That interpretation doesn’t make sense. Repeated subtraction does not correspond to division in the way repeated addition corresponds to multiplication.
If you divide 81 by 9 you subtract 9 from 81 until you get to 0. The number of TIMES you do that is the result “81 divided by 9”.
You chose 81 because it’s the one number that makes your argument appear to work. Try the same reasoning with 80 ÷ 9.