Have you never started working on reports or projects only when the deadline approaches? To be clear, I'm not saying ADHD people are immune to stress during crisis, but they thrive on that to an extent, because a normally dull task suddenly becomes exciting when there is a consequence to not doing it within a certain period of time. Not all crisis are suitable for ADHD people, I think. They do shut down when they come across certain crises that only creates dread without the benefit of creating excitement.
Yeah it's a spectrum. Affects different people in different ways. Do you actually like the project? Could just be something you don't enjoy doing, so deadlines are not gonna help much.