What you have failed to grasp is that people are not logic machines. "First chatbot" is never uttered to mean the absolute first chatbot – for all they know someone created an undocumented chatbot in 10,000 B.C. that was lost to time – but merely the first chatbot they are aware of.

Normally the listener is able to read between the lines, but I suppose there may be some defective units out there.

It's like arguing over who invented the light bulb or the personal computer. Answers other than "Edison" and "Wozniak", while very possibly more correct than either, will lead to an hours-long argument that changes exactly 0 minds.