The reasoning behind avoiding things like aged cheese and other (frequently) mold contaminated foods (things like mushrooms, corn, etc.) is that when people are very ill with candida, their systems are overloaded with the toxic chemicals the candida produce.
The toxins build up in the body- this is why people feel diffuse physical, cognitive and emotional symptoms. The entire body is dealing with poison!
The above foods add more of the same toxins to the body. It is not that they "grow" candida, but make the body continue to struggle.
Other foods, like vinegar/fermented foods may interfere with probiotics. (i.e., you can find a forgotton bottle of vinegar in the back of the cupboard- no matter now long it's been there bacteria will NOT grow in it)!
The chemicals released by the candida also "kill off" their bacterial competition.
Yes, it is so that many people have candida in the gut without a problem, and that difficulty is caused by an "overgrowth."
Clearly there are different opinions on this forum. I prefer to rely on what Science can tell us. It is too bad that it is so far removed from medical practice!