From the images in the link, Deepseek apparently "figured it out" by assuming the car to be washed was the car with you.
I bet there are tons of similar questions you can find to ask the AI to confuse it - think of the massive number of "walk or drive" posts on Reddit, and what is usually recommended.
https://chat.deepseek.com/share/ewfxrfhb7obmide29x it understands it perfectly if you don't disable reasoning.
it works fine even without DeepThink to sovle reasoning problems
https://chat.deepseek.com/share/s9tuh3hpzlxaxrfcae