Starting Hand Charts are guides - they are not meant to be taken as gospel.

Miller even says that the difference between one starting hand that they recommend and one they don't is often so marginal that you could play either way and it would make little difference overall.

As such, the difference between QTs and Q9s is actually very small and so you do not make a major error if you call Q9s or fold QTs.

What is more important is to remember that NEITHER of these holdings is particularly strong. There is a good chance that you are going to need a flush, straight or trips to win.