But no matter what definition you take Siri was not the first AI. It's a classical cases of Apple fans thinking Apple invented everything because they saw it first in an Apple product...
If you think about AI in broad terms, it goes back to the 1970's where any skill computers gained originally thought as only human was called AI. Like playing chess.
If you think about the recent use of AI = LLM chatbots/gen AI, Siri wasn't an LLM.