I would advise you to talk to your doctor about this and see if testing needs to be done. Your listing didn't include this cheese. I know that you're reading it wrong, exactly what Kraft wants you to do. It does not in fact say lactose free. It says 0 grams of lactose per serving , a very different thing.
All aged cheeses are low in lactose.
If you choose your serving size carefully enough, you can always get the lactose content down below 0.5 grams in a serving, at which point the government will legally allow you to say 0 grams. So the lactose content is undoubtedly less than 0.5 grams per ounce, which is the size of their serving. It may be much lower, but there is no way to tell. It seems as if it is derived from a Latin root word for milk, and therefore I am afraid to eat anything containing it without taking a lactase tablet. My dictionary shows it as coming from the Greek for egg yolk, which is quite correct.