as others have pointed out. The traveler does not need to show their TDAC. They only need to complete it before arrival. This is very clear and obvious to people who actually have experience in this area.
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.