The dishwasher will certainly sanitize your utensils, due to the heat. But that means killing microorganisms. Gluten can not be killed, and sanitizing has no effect on it. Gluten must be physically removed as part of the washing process. This is why porous or scratched surfaces are a concern.
Can someone tell me why my dishwasher would not sanitize my cooking utensils?
It is common for people new to the process to think that alcohol or other sanitizers will neutralize gluten, but that is not the case.